Thoughts are not the fruits of the earth. They are not registered by areas, except out of human commodity. Thoughts are clouds. . . . Thoughts never stop changing their location one with the other. When you feel like you have penetrated far into their intimacy in analysing either their so-called structure or genealogy or even post-structure, it is actually too late or too soon. One cloud casts its shadow on another, the shape of clouds varies with the angle from which they are approached.