PERSPECTIVE n.
pearance of objects, by means of which the eye recognized them as being at a more or less measurable distance. Hence, aërial perspective, the assumed greater vagueness or uncertainty of outline in distant objects. Aërial perspective is the expression of space by any means whatsoever, sharpness of edge, vividness of col…
UNDULATORY a.
s due to undulations in an ethereal medium, propagated from the radiant with immense, but measurable, velocities, and producing different impressions on the retina according to their amplitude and frequency, the sensation of brightness depending on the former, that of color on the latter. The undulations are supposed t…