People only see what they are prepared to see .
This activity is designed to show students how our mind connects two dimensional images to three dimensional reality. Our knowledge of space science changes as our skill for seeing what is in the night sky increases. With eyes as their only tools, early people watched the skies, telling stories to explain what they saw happening in the sky. For centuries people continued to watch the movement in the night sky, adding new knowledge to the old. Telescopes provided even better ways of seeing.