New answers tagged color-perception
For the white train, you can outline the circle with gray (the circle itself would have white filling) and then your train would be outlined in gray. This way, you get your white background and the train is still visible. For black train lines, you can have the background circle black, with a white train.
The short answer is: Yes, color changes perception. But "better for the human brain" depends on what UX problem you're solving. What you are really asking is, "better for my UX" or "better for my brand". Non-natural colors can stimulate the brain in a positive way also...for example, take a look at the Google logo. I don't think the natural vs unnatural ...
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