Question

​three-dimensional works art of define and occupy ______________—as opposed to illusory—space.

Answer 1

I believe the correct answer is that the Three-Dimensional works define and occupy actual space.

 

The Three-Dimensional artworks (such as installation art and sculpture) are site-specific and designed to transform the perception of actual space (indoors or outdoors), on the other hand, the illusionary artworks just appear to share the physical space with the viewer.