Final answer:
The second principle of durable typography is Balance, which affects the visual harmony of a layout and influences how text communicates, achieved through choices of fonts and design elements.
Step-by-step explanation:
The second principle of durable typography that designers and typographers consider is Balance. Balance in typography contributes to the overall visual harmony of a layout and influences how effectively the text communicates its message. This can be seen in the arrangement of text on a page, the choice of serif or sans-serif fonts, and the way elements like letterforms are designed with consideration to thickness and proportion. Whether using a modern sans-serif font for a contemporary feel or a classical serif font to evoke elegance, attention to balance is essential. Graphic designers strive to achieve balance, as well as unity and variety, emphasis, scale and proportion, rhythm and repetition, as well as considering the motion of the reader's eye across the page.