Why we're blind to the color blue
<a href="https://biology.stackexchange.com/a/49067" rel="nofollow">https://biology.stackexchange.com/a/49067</a><p>This effect can often be seen with stage lighting: Metallic/shiny objects, like the stands for the drum set, which are illuminated with both (deep) blue and red, will typically appear as a red line with a blue halo around it.