That is odd. I am using the RGB color model—typical in computer graphics—in which each element has 256 levels. I randomly select one of the 256 levels for each of the three dimensions, so I have a space of 2563 possible colors from which to draw. That's a big number (16,777,216 to be precise).
So why do so many of those 25 squares look so similar? Who knew there were so many minty greens?
Maybe it is a function of my color model. Let's try Hue-Saturation-Brightness instead.
I guess it is more visually appealing but I seem to have an awful lot of almost-blacks now. In short: just as bad.
I simplistically thought "OK, so I might be making some false comparisons here. Who says that an HSB model needs to have 256 levels on each of its components? And is a unit difference equally perceptible irrespective of level, i.e. is the color (0, 0, 0) as distinguishable from (0, 0, 1) as the color (255, 255, 255) is from (255, 255, 254)? Perhaps I just need to choose a different number of levels and I'll get 'better' random colors".
Not so much. A quick Google search reveals a huge rabbit hole down which I could disappear. Even simple questions like "How many colors can we perceive?" give answers ranging from 100,000 to 10,000,000. And there are a bunch of perceptual colour models that I had never heard of before. NCS? Munsell? I never got past Goethe. Maybe I should just find a Pantone color list and draw randomly off that.
This might take a while.
By the way, if you want a copy of the Processing script that produced these images, you can find it here.