The above piece is a lithograph by M. C. Escher. How has Escher used the concept of space effectively?

i came across this and i found it funny that when you're bored you play hangman on so im going to guess a : )

cad, or computer-aided design and drafting (cadd), is a software for design and technical documentation, which is an automated process as opposed to the manual drawing of plans. this gives a person an advance in making plans as an architect in a short period of time. one who can render plans through this software will gain a skill that is better than one who makes plans manually. this is a skill some companies look for in an employee.

this is the picture for the question