What is JacketFlap

  • JacketFlap connects you to the work of more than 200,000 authors, illustrators, publishers and other creators of books for Children and Young Adults. The site is updated daily with information about every book, author, illustrator, and publisher in the children's / young adult book industry. Members include published authors and illustrators, librarians, agents, editors, publicists, booksellers, publishers and fans.
    Join now (it's free).

Sort Blog Posts

Sort Posts by:

  • in
    from   

Suggest a Blog

Enter a Blog's Feed URL below and click Submit:

Most Commented Posts

In the past 7 days

Recent Comments

  • Erna on Clouds, 7/10/2013 1:02:00 PM

Recently Viewed

JacketFlap Sponsors

Spread the word about books.
Put this Widget on your blog!
  • Powered by JacketFlap.com

Are you a book Publisher?
Learn about Widgets now!

Advertise on JacketFlap

MyJacketFlap Blogs

  • Login or Register for free to create your own customized page of blog posts from your favorite blogs. You can also add blogs by clicking the "Add to MyJacketFlap" links next to the blog name in each post.

Blog Posts by Tag

In the past 7 days

Blog Posts by Date

Click days in this calendar to see posts by day or month
new posts in all blogs
Viewing: Blog Posts Tagged with: symmetry, Most Recent at Top [Help]
Results 1 - 6 of 6
1. SDCC ’15: Top Cow Reveals New Lineup, Including: Sejic’s Blood Stain, Rommulus, September Mourning, and Symmetry

Image Comics imprint Top Cow announced a slew of new titles today at SDCC.

First up, we have Blood Stain, a series penned and drawn by Linda Šejić, wife of Sunstone and Rat Queens illustrator Stjepan Šejić.  Like SunstoneBlood Stain debuted as a webcomic.  The series focuses on Elliot Torres, a chemistry major who’s fallen on hard times and takes a job with Dr. Vlad Stein, who’s rumored to be insane.

BS01

BS02 BS03 BS05 BS04 BS06Next, writer-turned editor Bryan Hill will collaborate with artist Nelson Blake to produce Romulus, an action conspiracy series that pits the last member of a long lineage of mystical martial artists up against The Order of Romulus, a secret organization that has influenced the world from the shadows since the era of the Roman empire.

rom04 rom01 rom02 rom03

Then there’s September Mourning, a new comic whose Kickstarter just launched.  Top Cow founder and artist Marc Silvestri will team up with singer Emily Lazar to create an elaborate multi-media experience by combining comics, music, and social media.  The series focuses on “a lead character who finds herself split between worlds. She is a half-human, half-reaper hybrid who helps souls complete tasks they left unfinished before they died.  Standing against her are the forces of Fate, who seems to have turned against humanity, no longer maintaining the balance between good and bad souls.”

sm03 sm01 sm02

Finally, writer and Top Cow president Matt Hawkins will team up with illustrator Raff Ienco to invite you into a Brave New World-esque future where individuality, creativity, and negativity have been suppressed by medicine and selective breeding.  Despite this, one man and one woman manage to maintain the ability to think for themselves.  When they meet, they’ll spark a revolution that will determine the ultimate fate of mankind.

sym03 sym04 sym01 sym02

 

0 Comments on SDCC ’15: Top Cow Reveals New Lineup, Including: Sejic’s Blood Stain, Rommulus, September Mourning, and Symmetry as of 1/1/1900
Add a Comment
2. What role does symmetry play in the perception of 3D objects?

By Zygmunt Pizlo, Yunfeng Li, Tadamasa Sawada, and Robert M. Steinman


The most general definition of symmetry is self-similarity: that one part of an object, pattern, signal, or process is similar, or more-or-less identical to another. According to this definition, the complete absence of symmetry is equivalent to perfect randomness, so symmetry is another name for redundancy. This makes the connection between symmetry and Shannon’s information theory explicit. The presence of symmetry also means that engineering and biological signals can be “compressed”; redundancy inherent in them can be reduced or even removed.

animation1

Symmetry is ubiquitous, as well as important, in our natural environments. There are several types of symmetry. The human body is mirror-symmetrical, one half is a reflection of the other. The two halves are never perfectly identical, but they usually are nearly so. The same is true of the bodies of almost all animals simply because mirror symmetry facilitates effective locomotion. A person could not walk and run along a straight line if his body were not mirror-symmetrical. A bird could not fly along a straight trajectory, and a fish or reptile could not swim along a straight trajectory if it were not mirror-symmetrical. Flowers are characterized by rotational-symmetry and many plants are characterized by translational-symmetry as well as by rotational symmetry. Man-made objects are usually made symmetrical because of the function they serve. A typical chair is mirror-symmetrical and a screw driver is rotationally-symmetrical. A completely asymmetrical object would most-likely be dysfunctional. Considering the fact that most things in our environment are symmetrical, one would think that our visual system should, at the very least, “know” about symmetry, and hopefully make good use of it. Symmetry is important not only because “it is there”, but also because the presence of symmetry implies that objects have shape and that scenes have structure.

Recently, we have been able to collect empirical evidence showing that the human visual system (one can also say, the human brain) uses symmetry to see 3D objects and scenes vertically (as they are). Symmetry is a natural, powerful predilection of our mind. It forms a large part of our a priori knowledge about the animate and inanimate things in the world around us. We are born with the concept of symmetry already in our minds. Why not? Symmetry is a mathematical concept, something that exists without any experience with the physical world. If our DNA contains information about the symmetry of our brain, why shouldn’t the brain know about symmetry, whether it is its own symmetry, or the symmetry of the real 3D objects and 3D scenes with which the brain’s owner’s will interact?

animation2

Our computational models show that symmetry is indispensable for veridical vision. It is also indispensable for avoiding the horrendous curse called computational intractability. Recovering a 3D shape from a single 2D retinal image would, without symmetry, require examining what are often called an “astronomically” large number of possibilities. How large? How about 1010,000,000, a number starting with 1 followed by 10 million zeros. Considering the fact that the number of atoms in the entire Universe is estimated to be 1080, a 1 followed by only eighty zeros, astronomers should probably start calling exceptionally large numbers “visually” rather than “astronomically” large. The visual system, by using symmetry, does not need to explore even a miniscule fraction of this huge number of possible 3D interpretations. Symmetry, and only symmetry allows a human, or a robot, to select the right 3D interpretation on its first attempt.

Zygmunt Pizlo, Yunfeng Li, Tadamasa Sawada, and Robert M. Steinman are the authors of Making a Machine That Sees Like Us. Zygmunt Pizlo is a professor of Psychological Sciences and of Electrical and Computer Engineering at Purdue University. Yunfeng Li is a postdoctoral fellow at Purdue University. Tadamasa Sawada is a postdoctoral researcher in the Graduate Center for Vision Research at SUNY College of Optometry. Robert M. Steinman devoted most of his scientific career, which began in 1964, to sensory and perceptual process, heading this specialty area in the Department of Psychology at the University of Maryland in College Park until his retirement in 2008.

Subscribe to the OUPblog via email or RSS.
Subscribe to only brain sciences articles on the OUPblog via email or RSS.
Animations created and provided by Yunfeng Li and Tadamasa Sawada.

The post What role does symmetry play in the perception of 3D objects? appeared first on OUPblog.

0 Comments on What role does symmetry play in the perception of 3D objects? as of 5/22/2014 5:18:00 AM
Add a Comment
3. Clouds

I was watching the clouds one rainy afternoon.  And as they sailed swiftly across the sky in an ever-changing variety of shapes and squiggles I remembered a quote from Thomas Browne.  In 1635 he wrote, “Nature is the art of God.”  I thought, I believe it because right now, the entire sky looks like His own personal Etch a Sketch.  I mean, first there was a hole in the clouds that morphed into a five-pointed star before it got sucked into a shrunken pinpoint that was suddenly the eye of an alligator that chased a hump-backed snake.  Highly entertaining.  Almost started singing, “I know an old lady who swallowed a fly . . .”

Can’t tell me that God doesn’t have a sense of humor. The alligator made me wonder briefly if animals ever marvel at God’s Etch a Sketch? After all, my two pooches are pretty smart and I do catch them scanning the sky every so often.  Speaking of pooches, who cannot see God’s hand in all of creation:  from the perfection of a playful puppy’s soft, furry paw to the swiftness of a hungry cat’s claw . . . to the flawless symmetry of a daisy or black-eyed Susan.  Happenstance?  Occurring by chance? I think not.  After all, according to Genesis 1:24, “. . . and God said, let the earth bring forth every kind of animal — livestock, small animals, and wildlife.  And so it was . . . and God said it was good.

Seen my books? “The SEED” a Novel of suspense that placed as a top ten finalist and was nominated to be put on a college required reading list.  And the Johnny Vic historical adventure series (mixing treasure hunting, adventure and American history!).   Go to http://www.annrichduncan.com.


1 Comments on Clouds, last added: 7/10/2013
Display Comments Add a Comment
4. Hexagonal-tiling system for isometric labyrinth game. ©2013 Dain Fagerholm

Hexagonal-tiling system study for labyrinth game. ©2013 Dain Fagerholm by dain
©2013 Dain Fagerholm
ink pen and color dye marker on watercolor paper
10 x 15 in.
2013 

0 Comments on Hexagonal-tiling system for isometric labyrinth game. ©2013 Dain Fagerholm as of 3/1/2013 5:34:00 PM
Add a Comment
5. Who was Dorothy Wrinch?

Remembered today for her much publicized feud with Linus Pauling over the shape of proteins, known as “the cyclol controversy,” Dorothy Wrinch made essential contributions to the fields of Darwinism, probability and statistics, quantum mechanics, x-ray diffraction, and computer science. The first women to receive a doctor of science degree from Oxford University, her understanding of the science of crystals and the ever-changing notion of symmetry has been fundamental to science.

We sat down with Marjorie Senechal, author of I Died for Beauty: Dorothy Wrinch and the Cultures of Science, to explore the life of this brilliant and controversial figure.

Who was Dorothy Wrinch?

Dorothy Wrinch was a British mathematician and a student of Bertrand Russell. An exuberant, exasperating personality, she knew no boundaries, academic or otherwise. She sowed fertile seeds in many fields of science — philosophy, mathematics, seismology, probability, genetics, protein chemistry, crystallography.

What is she remembered for?

Unfortunately, she’s mainly remembered for her battle with the chemist Linus Pauling. Dorothy proposed the first-ever model for protein architecture, provoking a world-class controversy in scientific circles. Linus led her opponents; few noticed that his arguments were as wrong as her model was.

Why did he attack her research and career with such ferocity?

In those days before scientific imaging, scientists imagined. Outsized personalities, fierce ambitions, and cultural misunderstandings also played a role. And gender bias: Dorothy didn’t know her place. She didn’t suffer critics gratefully, or fools gladly. On a deeper level, the fight was philosophical. Imagination and experiment, beauty and truth are entangled inseparably, then and now.

Linus won two Nobel prizes. What became of Dorothy?

Dorothy, a single mother, came to the United States with her daughter at the beginning of World War II, and eventually settled in Massachusetts; she taught at Smith College for many years and wrote scientific books and papers. But her career never recovered. I wrote this book to find out why.

Marjorie Senechal is the Louise Wolff Kahn Professor Emerita in Mathematics and History of Science and Technology, Smith College, and Co-Editor of The Mathematical Intelligencer. She is the author of I Died for Beauty: Dorothy Wrinch and the Cultures of Science.

Subscribe to the OUPblog via email or RSS.
Subscribe to only science and medicine articles on the OUPblog via email or RSS.

The post Who was Dorothy Wrinch? appeared first on OUPblog.

0 Comments on Who was Dorothy Wrinch? as of 2/11/2013 7:20:00 AM
Add a Comment
6. Seeing Symmetry - a review

I'm on vacation this week, but wanted to point out Loreen Leedy's latest.

Leedy, Loreen. 2012. Seeing Symmetry. New York: Holiday House.

A teacher's dream, Seeing Symmetry is so much more than a book about symmetry.  It is the intersection of math, art and nature in a clearly illustrated book that is entertaining, participatory, and educational.  It's also correlated to 4th grade core curriculum standards for geometry (see Loreen Leedy's website). Notes, activities, math concepts and vocabulary are included as well.

More kids would like math if it were always presented like this.  Worth checking out!

Watch the video below, narrated by author/illustrator, Loreen Leedy, and read a detailed review @ Kirkus Reviews.


Free download of Spring Mirror Word Puzzles for teachers.

Today's Nonfiction Monday roundup is at Ana's Nonfiction Blog.

0 Comments on Seeing Symmetry - a review as of 4/9/2012 6:06:00 AM
Add a Comment