38. How is ornament related to mathematics?
39. What are the important divisions of mathematical ornament?
40. What happens when an ornament is developed from a natural source?
41. What is the source called?
42. What periods of design have most affected printing? Why?
43. Explain how each of the above periods influences modern typography.
44. What should be the typographer’s attitude toward the activities of designers of every age and period?
45. What has been the effect of mechanical development in printing upon typographic design?
46. Name some of the modern men whose work is of interest to the typographer.