I've found previous articles from the same source a bit thin. And I have a personal dislike of the author after reading the comments on another article on the site:
There's a title that says we're "hard-wired" for rc. Then makes claim that our aversion to corners is a result of socialisation (i.e. not hard-wired). The case is simply ridiculous. Do parents not mind when we play with jelly-fish, but get upset when we eat sandwiches? Do schools round the corners on textbooks lest children suffer physical or emotional damage from those nasty sharp corners?
There's no substance here, just vague claims and circular citations.
The some of the examples were pretty moronic:
Is a sunburst easier to process than a circle - well yea but you could equally have a complex object with rounded corners that was harder to process that a triangle.
Would you trust your child with a beachball or a scissors... really?
http://uxmovement.com/navigation/designing-tab-navigation-th...
I was happily surprised as this was a pretty good read with some interesting references (with criticisms as well). I hope the articles keep improving!