In the watercolor illusion, we feel that the inside area is filled with yellow color.
But the square area surrounded by the purple curves is just normal. We do not feel any purple region in it.
This means that our watercolor illusion is very selective. We visually extend the yellow color, but not the purple one.
ethanweber
What would happen if the yellow and purple colors were flipped on the right?
fredhu0514
Indeed, the watercolor is color-selective. Meanwhile, I think it might have something to do with the background color. Like CeHao1 commented, we visually extend the yellow instead of the purple one, under the case that the background is pure white. What if we change the background to a darker one, like gray or black? With curiosity, I found this watercolor illusion with purple and yellow but with a background of white and dark gray. When the background is white, everything looks as familiar as what we’ve seen in this slide. However, when it comes to the dark gray background, we extend the purple color. This finding is quite interesting.
In the watercolor illusion, we feel that the inside area is filled with yellow color.
But the square area surrounded by the purple curves is just normal. We do not feel any purple region in it.
This means that our watercolor illusion is very selective. We visually extend the yellow color, but not the purple one.
What would happen if the yellow and purple colors were flipped on the right?
Indeed, the watercolor is color-selective. Meanwhile, I think it might have something to do with the background color. Like CeHao1 commented, we visually extend the yellow instead of the purple one, under the case that the background is pure white. What if we change the background to a darker one, like gray or black? With curiosity, I found this watercolor illusion with purple and yellow but with a background of white and dark gray. When the background is white, everything looks as familiar as what we’ve seen in this slide. However, when it comes to the dark gray background, we extend the purple color. This finding is quite interesting.
https://www.researchgate.net/figure/Three-examples-of-watercolor-illusion-see-the-text_fig5_51782177