Interesting concept! It's like a mix of procedural music and Conway's Game of Life.
I wish I could speed up the tempo to see the canvas filled with some pattern, it feels too slow now, I think it could sound more musical too this way.
The special object is non existent, you can draw it of course but the special object could have been anything else as well and it wouldn't have made any difference to this submission.
It was a relaxing experience nonetheless, I feel like with some soft soundfont and a lot of reverb this could be even better. Maybe even multiple brushes at the same time doing different length patterns?