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And the winner, "Tux Paint, te quiero" ("Tux Paint, I love you"), by Laura D. (who's now 20 years old), from Argentina!
Some of our favorites:
Untitled, by Maiya Y., Sri Lanka,
"Fireworks" by Christina Q., USA, and
"Tux Celebration", Joanna A., Canada
Those kids are now 19-21 years old!
Tux Paint's directional brushes use trigonometry to determine what angle your mouse is moving when you paint. #PiDay2021
For a 40x40 directional brush, you'd want a 120x120 image. These options can be combined to make an animated directional brush, like "kuroneko" (black cat) or the squirrel. (The cat has two frames, the squirrel has three.)