Ilona - they are on a card that has foil stuck to it. That way there is no gap between object and reflection as there would be with a mirror. The card also doubles as a very good reflector of light too when you photograph things indoors by a window. Use it to light the shadow side of objects.

Message edited on: 03/16/2006 11:50

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html