This is the image I choose to define 2-Dimensional space.  

It is flat with no shading to give it body.  

These cats could be reproduced as a silk-screen, 

block print or paper cuttings.  

Good use of negative space and high contrast.

I have seen many of these type of ambiguous illustrations,

 but I had never seen the rabbit and duck 

mentioned in our reading. 

 So I went looking for it.  

There are actually two, but I choose this one 

as I thought it the better.

I appreciate the way the artist used shading to create the double effect.

 This was the original image I choose

 for the illusionistic 3-d example.  

While it is a good illusion,

 it was not created by the use of medium on a flat surface 

to give the illusion of depth. 

 So I went looking for other choices.  

These are two that I found.

 Having searched out another image that conveys 

"illusionistic space",  

I would like to share Michelangelo's "Creation of Eve"

 found on the ceiling in the Sistine Chapel.  

Michelangelo used pigments to create depth 

with perspective, shading 

and by layering the angels on top

 of the vignette of God creating Eve from Adam's rib.

http://www.wikipaintings.org/en/michelangelo/sistine-chapel-ceiling-creation-of-eve-1510

I choose this chalk drawing because so many of us enjoyed

 the illusions created by these sidewalk artists. 

 I find this one particularly good because of the colors used 

and the image it portrays. 

 I would like to know what these artist use; 

if it's chalk, what kind can cover so well 

and if another medium, are they permanent?

Don't you just feel like you could go over and look in?