Small impossible staircase:
nice and simple, nice cell shading!
how do you do that 5hit?
WOW! I can see how you could do that in paint or the gimp, but just not in blender. Hmmm… Forced perspective, shaping it so that it looks regular… AHA! You shaped it perfectly so that the outer box is sloped, and the slope and shape of it are just perfect to make it look like an ortho rendering when it is in fact a PERSPECTIVE RENDERING. You then use this misconception to create the optical illusion! Am I right? Hmm… :-?
Hmmm… My english is poor 
I used only 3 3D objects and 12 planes…
post a top view wireframe?
how about 360 degree rotation animation ? 
.b
Top view wireframe? 360 degree rotation animation?
I think it is impossible in Blender 