on the wall
prep. phr..prep. phr.. Describes something that is attached to or hanging from the vertical side of a room, like a picture or a clock.
prep. phr.. A prepositional phrase indicating that an object is affixed to, hanging from, or positioned against a vertical surface.
The clock is on the wall.
We hung our family photos on the wall in the hallway.
Intricate tapestries depicting historical battles were hung on the wall, lending an air of solemn grandeur to the great hall.
Used for objects attached to a vertical surface, not for things simply touching it from the floor.
Contrast with 'at the wall' (proximity) and 'against the wall' (support/touching from the ground); 'on the wall' implies suspension or attachment.
The picture is in the wall.The picture is on the wall.Use 'on' for surfaces and 'in' for enclosed spaces; a wall is treated as a surface.