People travel on the escalator; some are going down to the lower level, while others are going up to the next level.
People are on the escalator
There is no escalator
A crowded street.
A boy watches television at a couch.
Three cats
a man plays an instrument
A girl in a bikini at the beach.
Biologist Stuart Kauffman has glimpsed a mysterious antichaos force at the Santa Fe institute.