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Round walls were harder to knock down than right angled walls. If you hit a round wall not much damaged would be made but a right angled wall would cave in.
Castle (or other walls) are called concentric if they form a series of (very roughly) cirular walls round one centre. By the late Middle Ages major castles in Europe often had three walls round a central keep.
It would depend on what the walls are made of. With thin wooden walls you may hear sounds, but with thicker brick or stone, no.
cars that drive on walls
Round the Twist - 1989 If the Walls Could Talk 3-12 is rated/received certificates of: Australia:G
sounds like your a monkey
chair legs and round surfaces such as table legs. round wooden surfaces
Romanesque Architecture
Yes they do, I'm looking at one right now.
Round the walls of the tombs of the Pharaohs in the valley of the kings.
Romanesque
Sounds can be reflected, for example, from walls.