> why did the phone guys make theirs upside-down?
Go to the "Keyboards" section of this course outline
and follow the link to the PDF copy of the "Bell Labs 1960 study". In short, it's because that configuration ranked highly for inputting phone numbers. If you take a look at the image provided of the button-based phone's predecessor
you'll see that 7, 8, 9, and 0 are at the bottom and 1, 2, and 3 are at the top. I'd guess that made that structure more familiar to the test subjects, along with the fact that English is read from left to right, and from
... in case you hadn't noticed
... top to bottom
. With those two points in mind, my question to you is, why are the keys on numeric keypads and calculators upside-down?