You are installed street of la Reine Blanche? Listen to this end of conversation between an imp and human:
Now that I know that you are there, I will not be quiet anymore, said Master Gobelin
It was already the case before you do not know it! the goblin answered.
The goblin, an imp who teases Master Gobelin. It settled at his place and it has fun to make disappear the objects. But the Master ended up unearthing his persecutor. Under a cupboard. He believed that it was a rat, which squeaked and, well, not, it was a small man not higher than a foot which made fun of him and which required hospitality. In exchange it promised to learn to him how to become rich and famous. It is a market at least as valid as to discover the philosopher stone. It is said that thanks to the goblin Master Gobelin managed to draw a scarlet which resembles human blood. How the imp proceeded, it should be imagined. Some say that the dyeing was drawn from the properties of the Bièvre, river now underground which ran close to the house of Master Gobelin . It is also said that it is to the urine of Parisians that the river owes this nature. And even, Rabelais wrote that it is because of a pack of dogs which was relieved there. But perhaps that the craftsman quite simply learned to laugh. He worked without concern about money, quietly and became rich and famous.