The Elements of Perspective / arranged for the use of schools and intended to be read in connection with the first three books of Euclid

by John Ruskin

If within the larger, the whole of the bottom of the dish is seen from above, [Fig. 67.]

a

.

Fig. 67.

If the smaller circle is not within the larger, none of the bottom is seen inside the dish,

b

.

If the circles are above instead of beneath the eye, the bottom of the dish is seen beneath it,

c