Wall 

"QUINCE
Ay; or else one must come in with a bush of thorns
and a lanthorn, and say he comes to disfigure, or to
present, the person of Moonshine. Then, there is
another thing: we must have a wall in the great
chamber; for Pyramus and Thisby says the story, did
talk through the chink of a wall.

SNOUT
You can never bring in a wall. What say you, Bottom?

BOTTOM
Some man or other must present Wall: and let him
have some plaster, or some loam, or some rough-cast
about him, to signify wall; and let him hold his
fingers thus, and through that cranny shall Pyramus
and Thisby whisper."

From "Shakespeare's A Midummer's Night Dream"

Sacred Heart School, Residency Road, Bangalore, India