They have a profound psychological impact on us, and learning color theory is a big part of training to become a designer. Typography describes the fonts that a designer can use in their work, but it also is a specialized form of design. Someone has to lay out all those typefaces, and some jobs may require designing a font from scratch. Furthermore, there are many ways to modify existing fonts with kerning, tracking, and leading to flow into a design better without trashing the original typeface’s aesthetics.