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Glossary

condition a health disorder optical related to sight or
seeing
depth the apparent distance
away something is pixels small parts that make
up a bigger image
drift to move slowly or float
prey animals that are
focused concentrated on
something hunted and eaten by other
animals

hue a color or a shade of
color spheres ball-shaped objects
sways moves slowly from
interpret to understand side to side
something in a certain way

nerves tiny body parts that
carry messages to and from
the brain

This optical toy from the
1800s used spinning discs to
create an illusion of motion.
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