I agree that is an awesome piece of highly functional art Leon, reminds me of when my mate made his own harmonograph - looked a little similiar a bit hehe
also really love the Halley's shots.
amazing how many awesome aussie shots of these famous events are being uncovered and seeing the light of day once again thanks to this forum and its members - onya Mike, Mojo and all
cheers
PS. this is OT - but I notice there is a virtual harmonograph or two on the net these days - heres one
http://fergusmurray.members.beeb.net/Trochor.htm