https://en.wikipedia.org/wiki/Grid_illusion
I experimented with different colors, but seems like all of them produce this illusion :/
I'll see what I can do.
* rounded corners to make rectangles look more pleasant
* switched to pastel colors to lower the contrast and make the grid less taxing for the eyes
Thanks everyone for the input!
Personally I prefer fractals. A 6-sided hexagon is just 2* 3-sided triangles. Or 6 of them, depending how you prefer to tile the plane.
https://i.pinimg.com/originals/c9/44/99/c94499bb9a0057f8573e...
So how about a day schedule organised by Sierpinski triangles? Lots of space in the middle for resting.