IN A SIMILAR VEIN, TEXT WRITTEN IN ALL-CAPS ISN'T ANY LESS LEGIBLE THAN TEXT WRITTEN IN lowercase; however, I'm sure you found the beginning of this sentence mu

IN A SIMILAR VEIN, TEXT WRITTEN IN ALL-CAPS ISN'T ANY LESS LEGIBLE THAN TEXT WRITTEN IN lowercase; however, I'm sure you found the beginning of this sentence much more irritating to read than its ending. It's about comfortableness, normality, custom. Serif evokes a relaxed, readable mood. Sans-serif is for quick points of information and eye-catchers. Capitals are for critical information. (And for us coders: mono-space is for code.) There's nothing innate to the form to justify this is so, it's just how we've been taught/grown to interpret their presence in text. If the form doesn't fit the usual function, we feel a little uneasy (even if we don't realize it). I'm sure people who haven't been taught the distinction won't have this uneasiness... A bit related: https://xkcd.com/1015/ https://xkcd.com/1015/