I just had an idea too cool not to share. Someone wanting rapid access to a ritual casting makes the elaborate pattern by pressing wire into wet plaster on the wall, and while chanting they’ll pull on the nib that sticks out, so the ritual carves itself in the wall as the wire pulls out through the surface of the plaster.
Could be a ghost door, or a more mundane message left with flair. Part of a riddle hunt. But there’s a wire sticking out of the wall, and when you pull it the wire tears out of the plaster, carving a track like a marble rolling down the invisible pipe, making visible the pattern that has been dormant there all along.
Could even do it as a flashback
Cool! Maybe you dont have to even pull as long as you can power up the hidden pattern with electroplasma or other weird energy. This reminds me of that entry from the “Turf Claims” table (really hope that John will bring it back):
“Strange – Rivals get a bad feeling when they hang around here…” or “Strange – The spirits around here harass everyone but you…”
For each, answer the question: What kind of operation would result in this claim?
Why? Ritual conducts hidden in the plaster, that’s why!