Related Clues:

• Ball in the skull
• Globular organ
• __ drop
• A Cyclops has one
• Optical organ
• Attentive watch
• $1 bill illustration
• Important organ
• Flower center
• Organ on the Great Seal of the United States
• A patch may cover one
• Peacock-tail illusion
• See 1
• See 14
• Look both ways