 The distinction between content and object enables Twardowski to clearly distinguish conceptualizations regarding parts of the object from conceptualizations regarding the parts of the content (as special cases of objects). This, in turn, enables Twardowski to offer sophisticated considerations, leading him among others to fix clearly the notion of the characteristic mark (Merkmal, nota) of an object. Twardowski calls elements the parts of the content of a presentation; he calls characteristic marks the parts of the object of a presentation (§8, 46–7); the characteristic marks of the object are presented through the elements of the content. The content of a presentation is the collection of the presentations of the characteristic marks of the object of the presentation. The notion of characteristic mark is a relative one because only the parts of an object that happen to be actually presented in the content of a presentation in someone's mind qualify as its characteristics.