This is a series of web pages designed to illustrate simple physical ideas using photographs of natural phenomena and our everday surroundings. Each topic has some brief explanation and comes with a downloadable poster (in Adobe PDF format) which is printable in sizes up to around A3.

The following topics are in preparation:

• Introduction
• The polarization of the sky
• The colour of the sea

Last update: 17 August 1999: rfosbury@eso.org
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