Woody Flowers gave this hint
"Just be careful about the stock market, with jello, gerbils, and
K'nex blocks."
The first thing I thought of was Blue chip stocks, Jello coin wheels,
hamster wheels and for k'nex ferris wheels are a recurring theme ...
You are all too young to remember Jello coin wheels so here is a picture
that may get you thinking
A similar thing would be a poker chip stacker or caddy.
I'm thinking along the lines of rotating wheel like the jello wheel
above into which you have to stack chips something.
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Link to k'nex that illustrates how Ferris wheel centric they are.
http://www.knex.com/Shop/home.php?gc...FSdysgodUEAUtA
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Ok, that's my two cents