As a result of this rotation, the point A′ that was initially on the wall straight across from the puck has moved (following the magenta dashed line) to the position B′, so to ...As a result of this rotation, the point A′ that was initially on the wall straight across from the puck has moved (following the magenta dashed line) to the position B′, so to an observer in the rotating room, looking at things from the point O, the puck appears to head for the wall and drift a little to the right while doing so.