Fantasy Trip Illusions

[Skarg]

Originally Posted by Keysh

Could an illusory person/animal/monster push their way through a crowd of people, or a herd of sheep? Yes. Could it push its way through heavy undergrowth? No.

I think an illusion would be slowed by heavy undergrowth as if it were real, but if a real figure could push through, so could the illusion. After the illusion passed, though, the undergrowth would just show not signs of having been pushed through. No?

Otherwise, I would think that any surface that should show disturbance when an illusion passes over it (e.g. a puddle, or dust, grass or leaves or snow or almost anything but a hard clean surface) would not seem to react and so give away the illusion.