Possible Clues:

• Illusions when space station gets past its prime
• In short film, see red illusions
• You can't inspect them too closely
• Sights not to be believed
• Lakes in the desert, say
• Sahara sights
• Magicians engrossing one with ultimate in colour illusions
• Oases in cartoons, e.g
• Saharan illusions
• Disappearing lakes, e.g