The emotion required to enjoy the sublime spectacle prevents any rest, especially for the eyes. The infinite space of the sea is tiring for vision. In order to gaze at a vast object, “the eye must traverse the vast space of such bodies with great quickness; and consequently the fine nerves and muscles destined to the motion of that part must be very much strained; and their great sensibility must make them higly affected by this straining”. The eye that contemplates an extensive, uniform object “does not readily arrive at its bounds; it has no rest whilst it contemplates them”. This labour has, however, a therapeutic value.