Simply because their brain can't distinguish between an artificial wall, and their natural habitat ! In the wild, they would cling to vertical rock-faces to keep away from predators. A brick wall is...
There are these things called Magnetacks that may hang up the blanket on the wall. Depending on the weight of the blanket it may take a few Magnetacks strung across the top to get the job done, but...
A cell is like a brick because the brick is part of the brick wall that covers your body and can be seen through out yourself.
Cells are like a brick wall because a brick wall is a cluster of these...