Blood Cells in the
Cells in the Eye shows visitors the blood cells of their own eyes.
When the visitor looks into a special cylinder, he sees bright sparkles
against a blue background. The sparkles move in the rhythm of the
visitor's pulse. These sparkles are the red corpuscles in the blood
vessels that bring nourishment to the retina. It's possible to see
these blood cells on a foggy day, but the blue light in this exhibit
makes them especially easy to see.