See manuscript’s transcription

### Overview of *Punctorum Relatio ad Planum Spectatoris* (1684 – 1687)

This manuscript probably belongs to a period between Leibniz’s beginnings on perspective and his last attempts, as it shows a similar approach to the later writings, yet less refined. Here we find one of Leibniz’s most important theorems about perspective: the ratio between the two coordinates used to identify a point in the apparent and in the objective plane (“inclinatio” and “declinatio”) is equal to the ratio between the distance of the spectator both from the *tabula* and the objective plane. The difference with the later writings is that here an unnecessary third plane is introduced, that is the plane parallel to the *tabula*, in which belongs the eye of the spectator. Since this introduction leads to a slightly different formulation of the theorem and considering Leibniz’s aim for simplicity in perspective’s writings, there are reasons to believe that *Punctorum Relatio ad Planum Spectatoris* precedes *Scientia perspectiva*.