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While I am not familiar with spinning these types of exhibits, I have seen and used quite a few of the parallel rows of LEDs that flash at different times to create words, pictures, logos, etc. I had a rather difficult time a number of years ago finding the artist who makes these items that he calls "Light Sticks" for places like The Exploratorium. We wanted to get one for one of our programs. You might want to ask him about about any feedback he's heard of or received regarding seizures. His name is Bill Bell and I believe that his company is called Subliminary Artworks in Boston. You may be able to reach him at 617-277-4719.
Martin S. Fisher
Director of Education
Nauticus, the National Maritime Center
One Waterside Drive
Norfolk, VA 23510
36°50'51"N 76°17'53"W 13 ft.
phone: (757) 664-1003, (800) 664-1080 ext. 41003
fax: (757) 623-1287 cell (757) 617-7080
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-----Original Message-----
From: Terry Coates [mailto:[log in to unmask]]
Sent: Wednesday, September 22, 2004 5:57 PM
Subject: flashing lights and persistence of vision
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
Hi everyone,
We have an exhibit that demonstrates 'persistence of vision' by rotating
a clear plexiglass disk containing rows of flashing LED lights. Spin it
at the right speed and it shows different shapes and images "floating"
in mid-air. We also have a smaller version consisting of small lights
on a rotating computer chip that when going fast displays images (there
are clocks like this). I also believe that the Exploratorium and a
science center in Kansas has exhibits like this.
Someone here brought up the concern that this exhibit could cause a
problem for people with photosensitive epilepsy and trigger seizures.
Our lights flash at frequencies above 100Hz but with the spinning effect
we have a question as to whether or not this will cause a problem. Does
anyone have experience with these type of exhibits or know of any other
science centres that have them? I am trying to get an idea of the
precautions and procedures necessary to put an exhibit like this out on
public display.
Thank you for your time.
Terry
Terry Coates, MSc
Exhibit and Program Developer
Science World British Columbia
1455 Quebec Street
Vancouver, BC
Canada V6A 3Z7
Tel: 604-443-7440 ext.7208
Fax: 604-443-7434
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technology in a fun interactive environment, promoting the development
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