In the Snack, Touch the Spring, there is a black box, but no black
mirror. The main thing in these Snacks is the reflection of light,
and which direction the reflections go thus creating the images.
To get a 16 inch (40 cm) diameter concave mirror you should check web
sites for scientific supply houses. Here are some that are listed on
the snack supplies page
You could also just do a web search for "concave mirrors" and you
would probably find some other possibilities.
> > firstname.lastname@example.org >
> I've seen the discussion about parabolas, but i didn't understand very well
> what efect does the black mirror make, does it form a 3D image of a given
> shape, i mean does it form like a sort of an holographic 3d image.
> Is there other ways to make an holographic effect (touch the spring)
> where can i buy A 16 inch (40 cm) diameter concave mirror A 16 inch (40 cm) diameter
> concave mirror on the internet, because i live outside USA
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