4 points
Because it’s too hard to crumple a sheet of paper into a cube.
3 points
Because throwing a paper ball into the bin( or the near floor) is far easier than a flat piece of paper.
1 point
You have been deceived. People always crumple paper into a flat disc shape. All evidence showing ball-shaped paper must have been fabricated.
1 point
It serves two purposes; easier to throw, and harder to read. You do it to things you don’t need anyone to read.
-1 points
1 point
IANAL, but I think it’s because balls are fun to play with.
1 point