Squarish Art Movement Founded by Pablo Picasso
Puzzle 13 of Countdown to 2020 Piece of Cake Pack
Question is: Squarish Art Movement Founded by Pablo Picasso
and the answer is: CUBISM
Word Meaning:
CUBISM — (often capitalized) An artistic movement in the early 20th Century characterized by the depiction of natural forms as geometric structures of planes.
Definitions from Wiktionary.