(noun) A rampart of earth, stones etc. built up for defensive purposes.
"In the house of lovers, the music never stops, the walls are made of songs & the floor dances."
"They say there is a doorway from heart to heart, but what is the use of a door when there are no walls?"
"Every wall is a door."
"It's silly to build a wall around your interests."
"It all began with a shoe on the wall. A shoe on the wall shouldn't be there at all."
"A nation ringed by walls will only imprison itself."