[internaut]

Very clever!

Aside from illusions there are many interesting proposals using mirrors.

I think most people don't think you can use mirrors with fibre optics to bounce daylight directly into people's houses for indoor lighting. There is also this cool trick you can do by using something called a 'cold mirror', where the visible spectrum is tapped into for lighting but at the same time the IR portion of the spectrum passes through the cold mirror and onto a solar thermal tank for making hot water.

All this, with mirrors!