I am not color-blind, but there are shades of colors that, depending either on light source, what other colors are around, or just how I'm thinking about what I'm looking at, will switch back and forth. I can pick out purple from violet, but I have had some clothing that will either appear purple or grey depending on how I am thinking about it (really). Similarly, I have a hoodie that is a timber green that at times appears brown, and a pair of corduroys that are brown that at times appear vaguely purple. I am nearly certain these shifting hue effects of the dyes were intended by the manufacturers.

It's extremely subtle to me - the bottom horizontal stream gets very very slightly greener when it gets bigger. I noticed it first because the starry swirl thing above it, bottom right of the big black thing, seemed to change shape as though the actual brush strokes were different, bit more of a classic star shape emerges. But it's extremely slight, more like the 'what a colourblind person would see' filtering is imperfect than that I can actually see the original.