Rounded corners are a utilitarian feature. Human vision is based on edge detection and corners unnaturally activate it more than necessary. It's basically like being continually poked in the eye.

https://folklore.org/Round_Rects_Are_Everywhere.html

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cachius a day ago | parent [-]

The link tells the story how Bill Atkinson sped up drawing primitives on early Apple devices.

It does not support the claim that corners are in any way special for human vision. I’m very skeptical on that. AFAIK motion is most easily perceptible.

	▲	astrange a day ago \| parent \| next [-]
		Ah well, the evidence for my claim is that I just told you. This particular claim is not a Steve Jobs story, but he would agree I think. I did tell a true and previously unreported Steve Jobs story on reddit the other day and was voted to -10 and someone told me I was off my meds. In conclusion, Steve Jobs is a land of contrasts. > AFAIK motion is most easily perceptible. That's how it works for predators, but you can see things that are still if you're focusing on them. It's important to see corners in real life because they actually can poke you. Like a paper cut.
	▲	Lammy a day ago \| parent \| prev [-]
		> It does not support the claim that corners are in any way special for human vision Your binocular field of vision is a round rect: https://openbooks.lib.msu.edu/neuroscience/chapter/vision-ce...