> tracks the sun. With a flat mirror, this becomes a don't-care,
> and each mirror can be independently steered by a simple
> heliostat

Like a solar furnace ?

http://www.amasci.com/amateur/mirror.html

I've seen the one in New Mexico. A large array of flat mirrors
reflect sunlight onto a collector up a tower. Very very hot

I remember seeing a sewage treatment method using something
similar. The sewage or other waste water is loaded with titanium
dioxide (the pigment in white paint) and run through a transparent
pipe. Solar reflectors heat the water and also bombard it with a
very high dose of UV. At the end of the pipe-line the TiO2 is
filtered out, leaving potable water

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