Andreas Aronsson is a professional IT technician by day and an awesome optical illusion artist at night: he made a series of cleverly drawn "impossible figures" that at a glance look perfectly fine, but upon closer inspection will give your mind some sort of a Twilight Zone moment.
These are awesome, trust me: Link
Paul in Boca
mc escher rip off
Gail Pink
Very MC Escher-esque!
Brandon T
That would be a sweet level for Echochrome
Ben Eshbach
Does anyone know where to get that cool perspective-ready graph paper?
liphttam1
Theres at least four "whoh zones" in each of the pictures.
BOLL
Paul in Boca: Actually it would make much more sense to call me an Oscar Reutersvärd ripoff!
(http://en.wikipedia.org/wiki/Oscar_Reutersv%C3%A4rd)
Brandon T: These are _very_ hard to rotate as they are created in three point perspective, with the distortion it brings, in contrast to Echochrome which has levels displayed in parallel projection specifically to avoid that distortion.
(http://en.wikipedia.org/wiki/Perspective_projection_distortion)
Ben Eshbach: The perspective grid in the background actually differs for each piece. It is created after the figure is finished from the used perspective points and is not a premade graph paper used in the actual creation process. Dick Termes includes a number of perspective grids in his Book On Perspective Drawing, but you have to buy it for $10.
(http://www.termespheres.com/perspective.html)
Thank you Neatorama for posting my blog, and thanks for the comments! 
Ben Eshbach
Boll - Thank you for that info. I suspected that was the case when I took a closer look. It appeared that if it was premade then it would really limit the orientation (viewer's perspective) of anything drawn on it. Very impressive stuff!
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