Here are a couple of fascinating creations by artist Peter Callesen the first creation is a closeup of the original piece. The only material used is Acid free paper, pencil, and glue.
I love the skill and creativity of this artist. Is this skeleton breaking free of his two dimensional chains or settling in for a nice long nap.

Half Way Through (Detail view)
Peter Callesen
(c)2006
This image is also just paper and glue. Makes me yearn to be a kid, just to have the chance to play with the glue again. Check out Peter's other works at his site.

Looking back
Peter Callesen
(c)2006
Peter, You do great work. Well Done!
Here is a digitally manipulated photo created in the style of M.C. Escher, purposefully designed to make you question which way is up. How many different photos were used in creating this photo?

Which Way
created by sirchopsalot
@ PSTKudos to Sirchopsalot for a wonderful creation.
Below is a montage of the original images used to create this very interesting Escheresque image.
If you guessed nine different photos, congratulations you are correct.
Again I take you into the Etc... of Optical Illusions Etc... Not everything in this blog is an optical illusion, some of it is frightenly real.
On August 11, 1999 a mysterious black mass swarmed across the surface of the planet. This might be biological in nature if it wasn't for the fact that it moved at almost 2000 kilometers per hour. Could this be extraterrestrial in nature? Is this phenomenon proof that we are being visited from other worlds?

Credit: Mir 27 Crew; Copyright: CNES
source
Explanation: Here is what the Earth looks like during a solar eclipse. The shadow of the Moon can be seen darkening part of Earth. This shadow moved across the Earth at nearly 2000 kilometers per hour. Only observers near the center of the dark circle see a total solar eclipse - others see a partial eclipse where only part of the Sun appears blocked by the Moon. This spectacular picture of the 1999 August 11 solar eclipse was one of the last ever taken from the Mir space station. The two bright spots that appear on the upper left are possibly Jupiter and Saturn, although this has yet to be proven. Mir was deorbited in a controlled re-entry in 2001
This film is the creation of Yutaka Akita. This short film has bits and pieces of many favorite illusion topics such as recursive, fractals, tessellations, and perspective. He describes this video as follows:
"This is application experiment of optical illusions commonplace in 2-D animations in 3-D spaces. The animation develops through illusions caused by concurrent different perspectives of simple lines and surfaces. It is a non-narrative film aiming to make viewers feel bizarre yet fascinated by a feeling of floating between real and unreal."
For more films from this artist go to this site. Here is a short biography he provided on his Dailymotion page.
"Born and bred in Yokohama, Japan. After a study of Byzantine art at Waseda University, surprisingly Yutaka started his career in the film industry where crazy yet creative people are working hard every night and day to make something amazing. Couple of years after, he alone went all the way to the UK to cultivate his style and techniques as an animator/director. And here he is, working on a variety of projects including promotion video for Madame V spring/summer collection 2007, James Bryan “Beautiful World” video, etc. He also worked for Johny Mourgue, one of the film director in FLYNN Productions and made a pitch for Beck’s album “Cell Phone’s Dead” TV spot. *showreel available on requests."