The Tagge's wrote:

The design [color, pattern, coolness] is much more important than the
mechanics. This is their design. Let them do it, and you just help them.

This is the part that appeals to my daughter the most. I've always
wanted to do metal casting, and she likes to sculpt in clay, so we're
going to see if we can't make the ballast weight an interesting
shape. I'm inclined to get a piece of the low melting point fixturing
metal, melt it in hot water and pour it into a silicone rubber mold
we make from her sculpture.

John