As I remember
... we had to sit incredibly still while he drew an outline around us with something. Actually, that could just be his 'magic' explanation for it, when in reality he did what you suggested...
(
Thy Maker Has it really been that long?,
Wed 11 Feb 2004, 16:49,
archived)
that was alternative two
long exposure
draw around the kids with a torch
then flash
you must have been jolly well-behaved kids
(or bribed)
(
Dr. Shambolic je suis charlie,
Wed 11 Feb 2004, 17:03,
archived)