Board Thread:Suggestions Forum/@comment-26295802-20150409224618

These would work like average signs except that they would have the stone texture during the day, and you couldn't read the words. But at night, the words would glow blue, and become readable. It would be crafted using the default sign recipe, except that the planks would be replaced with stone, and it would be crafted on a dwarven crafting table. Basically, the effects would be the same as that of the dwarven door. 