[Vo]:Casual observation of diffraction/interference of light

[Stephen A. Lawrence]

I've run across a couple of situations in "everyday life" in which it 
was possible to see obvious diffraction or interference patterns from 
light.  I find that sort of thing delightful -- no fancy equipment, not 
even a laser pen pointer -- so I wrote them up:

http://physicsinsights.org/interference_1.html
Includes a couple of moderately nice pictures of interference patterns. 
 (Well, I think they're moderately nice, anyway.)

Cheers...