In the middle of the wall, a cloth pattern that closely resembles the color of the walls had been laid there.
If it was during the day, it would have been obvious.
Or if we had the light from car headlights, it would look peculiar.
But with torches on the horse-drawn carriage, chances are that we won’t notice the difference.
However, if illuminated by the Spirit of Light, the difference can be seen.
I win.
I point my staff at the wall.