 |  | |
| a | b | |
| Fig. 74.—a. A disk (above) and a sphere (below) lighted from overhead. b. A disk and a sphere lighted by perfectly diffused light. | ||
Fig. 70.—A bas-relief lighted from above.
Fig. 71.—An intaglio lighted from above.
| | |
| a | b | |
| Fig. 74.—a. A disk (above) and a sphere (below) lighted from overhead. b. A disk and a sphere lighted by perfectly diffused light. | ||
Fig. 70.—A bas-relief lighted from above.
Fig. 71.—An intaglio lighted from above.