A cyclorama is a background tool created to allow the use of photographic backgrounds which blend with the foreground. It's available at DAZ, along with the Millennium environment. There are other tools that work better in different situations -- my personal favorites are the Infinity Cove are RDNA (www.runtimedna.com) and the similar tools they have there. wonderful stuff.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)