Upon the suggestion of Monroe Wheeler of the Museum of Modern Art in New York, Zapf decided to adapt his typeface to be used as a book type. “He thereupon changed the proportions of the lowercase, and by means of photography, he tested the suitability of the design for continuous reading application.” Zapf designed the capital letters of Optima after the inscriptions on the Trajan Column (A.D. 113). Optima is the first German typeface not based on the standard baseline alignment that had been used up until this point in time. Zapf states “This base line is not ideal for a roman, as it was designed for the high x-height of the Fraktur and Textura letters. Thus, too many German types have ascenders which are too long and descenders which are too short. The proportions of Optima Roman are now in the Golden Section: lowercase x-height equalling the minor and ascenders-descenders the major. However, the curved lines of the stems of each letter result from technical considerations of type manufacturing rather than purely esthetic considerations.”