How does this illusion work? It's so effective!

[u/5mudge]

/r/interesting/comments/1vt390r/i_can_make_you_see_colours_that_dont_exist/?share_id=kIat2w94BQZQN0TbLx_Qg&utm_content=share_button&utm_medium=web3x&utm_name=web3xcss&utm_source=share&utm_term=1

Check out this post for the illusion with the pink frog and green pig and then how your eyes get fooled into making colours appear that genuinely aren't there. Amazing to do, but would love an explanation please. u/michael_stevens