If you squint your eyes, the balls look red, blue, and green, but that's to be expected if there are colored bars over them. And if you don't squint your eyes, the "balls" look about the same color... So what's the illusion?
It’s really not a particularly interesting illusion.
In contrast, here the issue is undoubtedly in how the brain interprets the signal data, i.e., an illusion.
It’s not right to say that the balls are “brown”, when they are in fact striped brown and red/green/blue. It’s like saying that a zebra is black if you just ignore the white.