Related Clues:

• 'Mona Lisa' features that 'follow' the viewer
• Argus had 100
• "Windows to the soul"
• View-finders?
• Seeing things
• Mr. Potato Head piece
• Balls with lids
• Argus's 100
• Some are private
• Sight seers
• They may be brown or blue
• Men and women
• Needle parts
• They're all grown up
• They fill some holes in your head