[As promised, here's the first in the series about the tech industry's drive to reduce complexity.]
Remember the magic number? It's the one thing from Psych 101 that you should recall, since it pertains to memory. The brain has an upper limit on the number of chunks of new data it can stuff into working memory at one time. The number is around seven, plus or minus one or two depending on the person and the task. It's the limitation that makes the old game Simon challenging, and that bedevils us when we try to remember a phone number that someone just told us.
The magic number is one way in which the human brain tries to trim down complexity. Another more recent discovery is the brain's fuzzy boundary between literal and metaphorical statements. Attach a candidate's resume to a heavy clipboard instead of a light one, and the interviewer is more likely to treat the candidate seriously, because the resume seems somehow weightier.
Countless other examples exist where the brain takes shortcuts, filters information, and otherwise simplifies the constant, complex stream of perceptions, thoughts, feelings, and actions that would otherwise turn into a "blooming, buzzing confusion." We're not stupid creatures, but the machine that grants us powerful mental capabilities also puts limits on them.
The Death Star Would Be Great If I Could Figure Out What All These Buttons Do