TIL Anton Bruckner “had a compulsion to count things continually”:

In medical terms, this is called “numeromania” and professionally classified under compulsive disorders. He obsessively counted windows of building, cobblestones on the road, and number of bricks in a wall. Even worse, he continually counted the number of bars in his enormous orchestral scores to make sure their proportions were statistically correct.

Relevant: The Strange Affliction of Anton Bruckner (1990).