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You can use it to look straight up - shame you can just spin it - freeze it - and use it!
Better still - from myth busters trying to make Archimedes mirror to burn the Persian fleet. Jamie streched mirro shiny plastic foil over a round 44 gallon drum and vaccuum pumped out alot of air. The resulting shape in the foil is supposed to be perfectly parabolic!
What an easy way of producing a very large, very light, very parabolic mirror - where a change in vaccum achieved would change the focalpoint!
Suprised no one has tried this yet!
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