This is a drawing of a round metal grate with an intricate design. The drawing features a cylindrical object with a detailed geometric pattern on its top surface, resting on three short legs. The design includes a central circular motif surrounded by a series of interlocking loops and ridges that create an ornate pattern. Above the perspective view of the object, there is an overhead view showing the symmetrical layout of the design in greater detail. Additionally, a side profile of the object is depicted, highlighting the thickness of the top surface and the length of the supporting legs. A small scale in inches is also present beneath the side view. The drawing is meticulously shaded to give a three-dimensional appearance and signed by Filippo Porro.