http://www.detnews.com/apps/pbcs.dll/article?AID=/20090113/METRO08/901130364/1408/LOCAL It is actually very hard to find an acrylic or polycarbonate dome of such large dimensions -- .:.;:'¬;˚˚∆:;:,:;';,,';':;.:,:;:;',,':;.';:¬;;';-,,`⁄,