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.