Fantasy Trip Illusions

[Oneiros]

Originally Posted by Dave Crowell

Suggests that the physical rock will bounce off the illusory wall.

Except the line you quoted (emphais mine)

"Illusions or images of walls, fire, or shadow can be created. Illusions Work just like the real thing until disbelieved or destroyed by a spell. Images LOOK real, but vanish when hit, touched, or walked through."

could also be read that the rock hit the wall, so a rock or arrow interacting with a wall illusion would cause the wall to vanish. It doesn't state a creature has to hit the wall.