Get lots of little candles, preferably multicoloured, and melt them all down, separably. Get a can of some sort, and punch a hole in the bottom. Thread some string through it and tie it to a stick to rest on top of the can. Pour all the multicoloured waxes in strategic orders into the can, and leave to cool. When cool, cut the string off the stick, and try and get the candle out of the can.

Et Volia. A home-made physics ornament.