Illusionistic (3D) Space
This sidewalk painting illustrates illusionistic space by giving the viewer a sense that they could potentially walk right into the painting. The angle it is painted at gives it it's apparent 3D quality, and makes you feel as though the copiers, computer screens, and people are shaped the same as the real life objects they portray.
Flat (2D) Space
This digital painting displays a 2D space by only really being flat. There really is no "pop up" appearance to be found. It's a pretty straight forward, 2D image.
Ambiguous (2D/3D)
This drawing is a mix of 2D and 3D because of the varying degrees of depth portrayed. The upper half, and lower halves of the image appear to be flat, and without depth, but when you look at the middle, to upper middle portions, the 3D becomes apparent. It gives you the perception that you could fall into the bottomless hole, or perhaps walk down an endless hallway.