(???) ELLSIZE = 20
 (DOC) ef draw_bucket(ctx, bucket):
 (???)    for row_index, row in enumerate(bucket):
 (???)        for cell_index, color in enumerate(row):
 (???)            ctx.fillStyle = color
 (???)            ctx.fillRect(
 (???)                cell_index * CELLSIZE, row_index * CELLSIZE, CELLSIZE, CELLSIZE
 (???)            )