other form of Horizon, from whence those simple practisers of Lineal Perspe∣ctive, can derive the least conjecture how to proceed by in their Mechanical way: But these men are to know, that 'tis a most subtile, and refin'd address in Painting, to work things exactly regular and precise, and yet to conceal the Art.
Let us begin then first to determine the point of sight; since it is as it were, the very Center, to which every part of the Table has reference; and for that we have in this Piece, no lineal guides to conduct us; our Reason must supply that defect.
The Subject of this History being chiefly about Sight, and Paris the Per∣son principally concern'd in it; the Paynter could not have plac'd the Visive point more judiciously, than in the Eye of Paris, which, for this very cause, he has represented in Profile, to shew that there ought to be but One only, as Geo∣metricians teach us in their Optics, where they represent Vision, or the function of Seeing, by a radiated Pyramis with an Eye fixt upon it.
This establish'd, and rightly under∣stood, we proceed to observe in the Ordonance of this Composition, that