pinhole camera at science fair

Hi all:

My daughter has decided to do a project on pinhole cameras at her grade 6
science fair.

They need to do experimental sort of work - not just make a pinhole camera and
show their pictures.

I've suggested obvious things - determining the effect of different pinhole
sizes, distance of film from pinhole, alignment of film in camere, different
camera designs.

Any other pinhole experiments a couple of grade six students could do?

-- 
Gordon J. Holtslander		Dept. of Biology
gordon.holtslander@usask.ca	University of Saskatchewan
Tel (306) 966-4433		112 Science Place
FAX (306) 966-4461		Saskatoon, SK
homepage.usask.ca/~gjh289	Canada, S7N 5E2
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