Joy of Science - What is it?

[PollyOR]

If you've watched the Joy of Science DVDs, can you tell me what the glass sculpture is that is being used as a decoration? It looks like colored pieces/particles are floating at the top and gathered together at the bottom. Any ideas?

[PollyOR]

Found it! Galileo thermometer (http://en.wikipedia.org/wiki/Galileo_thermometer).