only see details with a tiny area of the eyea part of the
retina called the fovea. This exhibit demonstrates the sensitivity
of the fovea. After directly looking at a bright flash of light
visitors find that for a moment or two they are unable to make out
details in the street map in the exhibit. When a person looks directly
at something, its image is focused on the fovea, which is packed
with cone cells and allows the eye to see detail. After the flash,
it takes these cells a few moments to recover their sensitivity.