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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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Science World British Columbia, a self-supporting non-profit
organization, stimulates positive attitudes towards science and
technology in a fun interactive environment, promoting the development
of a knowledge-based society in British Columbia.

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