http://www.mymodernmet.com/profiles/blogs/karl-martens-watercolor-paintings-birds

http://www.cuded.com/2015/09/street-art-by-noe-two/

http://paperboxman.deviantart.com/

http://www.tokyogoodidea.com/the-rock-island/

Richard Russell  Harvard University, USA

In the Illusion of Sex, two faces are perceived as male and female.

However, both faces are actually versions of the same androgynous face.

One face was created by increasing the contrast of the androgynous face, while the other face was created by decreasing the contrast. The face with more contrast is perceived as female, while the face with less contrast is perceived as male. The Illusion of Sex demonstrates that contrast is an important cue for perceiving the sex of a face, with greater contrast appearing feminine, and lesser contrast appearing masculine.

Russell, R. (2009) A sex difference in facial pigmentation and its exaggeration by cosmetics. Perception, (38)1211-1219.

http://glass-crafts.wonderhowto.com/how-to/turn-boring-transparent-window-into-colorful-faux-stained-glass-masterpiece-0141536/

http://www.reddit.com/r/somethingimade/comments/176zp9/i_made_a_replica_of_the_4500_iron_man_stained/c82y5fl

http://imgur.com/a/GXUun#hO6wzrs

Some people are asking how… here is a brief explanation on how I did it with photos….
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https://www.fastcompany.com/91133306/dc-comics-style-guide-was-lost-for-years-now-you-can-buy-it

Reproduced from a rare original copy, the book features over 165 highly-detailed scans of the legendary art by José Luis García-López, with an introduction by Paul Levitz, former president of DC Comics.

https://standardsmanual.com/products/1982-dc-comics-style-guide