Leave a little mess.
Perfect pages make him suspicious. A crossed-out word is a doorway.
He showed up in the corner of a notebook, refused to leave, and somehow became the loudest thing on the page.
Nobody drew the whole bull.
First came a horn. Then an eyebrow. Then four heavy legs. By lunch, the page had a resident. He keeps the blank space nervous and the pencil sharp.
FIG. 01 — DO NOT PET THE MARGIN
Perfect pages make him suspicious. A crossed-out word is a doorway.
If the bull is staring at you, etiquette says you stare back.
He gets restless when the line stops. Scribble something. Anything.
There is no grand explanation. There is just the face, the horns, the stubborn posture, and that one tooth doing its best.

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXThe Doodle Bull · DOODLE