The sign does not represent its dynamic object thoroughly, but it selects some characters that allow for a partial representation of it. A painting, for instance, selects from its object predominantly qualitative characters, a footprint on the sand selects predominantly existential characters and a word, or any other kind of conventional sign, selects from the dynamic object a certain regularity, the law that rules the occurrence of object and that is represented by a sign of habit. The set of attributes selected by the sign Peirce is initially called ground, a term that already appears in the New List. Later, however, Peirce explains that ground corresponds to an “idea” in the platonic sense, that is, something that is in someone’s mind and that can be transmitted to another person (CP 2.228). The ground is, therefore, the Form (a conjecture, hypothesis, fiction, possible image) that allows the comparison between the contents in the mind (predicates) and the stimulus produced from the object (or subject) (EP1: 2). This comparison unites subject and predicate in a unity that is analogous to a logical proposition, producing information.