These are great guesses, but it doesn't look like they match with what's known about the earlier forms of these letters. https://en.wikipedia.org/wiki/History_

These are great guesses, but it doesn't look like they match with what's known about the earlier forms of these letters. https://en.wikipedia.org/wiki/History_of_the_Latin_script#Ultimate_derivation_from_Egyptian_hieroglyphs https://en.wikipedia.org/wiki/History_of_the_Latin_script#Ul... Particularly, the degree of sharpness or roundness of a particular letter may have changed a lot over time. I guess it's still possible that there's been some kind of psychological effect at certain times, but it doesn't look like it was a strong and consistent factor in the history of the alphabet.