Uncle Matt and a "Sidewalk Creature"

Sidewalk Creatures are what Uncle Traveling Matt calls parking meters in his postcard to his nephew Gobo in the Fraggle Rock episode "Don't Cry Over Spilt Milk."

Uncle Matt describes sidewalk creatures as sad little animals, rooted to the ground and unable to gather food. Hunger causes their faces to turn red (the "expiration" flag), and they must depend on kind Silly Creatures to drop food (coins) into their mouths. When Uncle Matt gives one a coin, he believes he has finally found a friend in Outer Space.