Air Currents in Foucault Shadowgrams

Here are two images taken with exactly the same parameters except that the one on the right was taken about a minute after I had walked between the tester and the mirror. The one on the left was taken several minutes later after things had settled down again.

This is my wife's hand held a few inches in front of the mirror.
She felt no pain at all :-)

Bill Arnett; last updated: 1999 Mar 3