 The passage makes a clear distinction between the immediate impression caused by an object, in this case, sensation of a flat circle variously colored, and the subsequent act by which, after a process of learning, the faculty of judgment “frames … the perception of a convex Figure”. In a similar vein, Berkeley distinguishes between the immediate objects of sight, which include light and color forming a visible extension with visible figure and magnitude, and the mediate objects of sight, informed by touch (Essay Towards a New Theory of Vision, 1709: sec. 49, 55). The immediate object of sight for an approaching object grows in visible extension. But, as the result of learning through the sense of touch, the perceiver experiences the mediate object of sight, an object of constant size. Hume offered a similar example: a table, considered as an external object, retains a constant size; yet our sensory image of it varies as we approach or recede from it (Enquiry, 1748: XII.I.9).