With the stripes faded, the green bars on both sides are plainly the same green.
Tricks of color
Munker illusion
Which green is lighter, left or right?
Neither: it is the same green, though the left looks lighter and yellower.
Why? Like White’s illusion in color: the stripes a color is woven into mix into it.
Picture: Mabit1, CC BY-SA 4.0 · Wikipedia(opens in a new tab)