Acoustic instruments.
Simple chord progressions such as C-F-G or Am-G.
Simple time signatures such as 3/4 or 4/4.
"Sharp" or natural keys such as C, D, E, G or A.
Simple scales such as pentatonic minor (blues), pentatonic major, major, melodic minor and mixolydian.
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.
