The correct answer to this question is "curving the forms of certain objects, such as the bookshelf and ceiling, in order to create the 3-dimensional sphere of the mirror." In order to create space, escher created space by doing this. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
Freestanding Sculpture is unattached to the background and has space on all sides. It is also referred to as sculpture in round. Unlike relief, freestanding sculpture can be viewed from all sides.
