horror vacui

noun3

1. •
   The abhorrence of a vacuum; the general tendency to dislike empty space.

   • It is merely the horror vacui of human reason in general which leads it to recoil when it comes across an idea about which no thought is possible, […] — 1991
2. •
   In particular, the tendency of an artist (or of art) to fill an entire surface with detail, leaving no blank space.

   • The Where's Wally? series exhibits horror vacui.
3. •
   (historical) The Aristotelian principle that there are no vacuums in nature.