Indeed. And if they actually crack open the door, you can always move the little box a bit. If it becomes a really regular occurence, you could create a half-circle of wedges, copy it on top of any and all doors you need, and just delete one wedge at a time as they open it more and more. But yeah, to second Mortikar in general: just create a different color shape in the dynamic lighting layer, and move it/delete it when needed. A second possibility, if you want to get really intense, would be to have the door on the token layer, write a door-opening script in the API, and have an identical door/door shape in the dynamic lighting layer (I haven't tried to see if tokens actually block light, or only drawn shapes). Then have the script move both icons along their axis of movement simultaneously (which is just arithmetic, if annoying arithmetic). But that's probably a lot of effort for an effect that even today's video games don't bother with unless there's a really, really good reason.