#1 Technically , these are not even squares, let alone being of same colour. Upper is grey with a black shadow, and lower is white with a grey shadow. So, not the same colour.
All the dots on this image are white, but some appear black.
No matter how hard you try, you won’t be able to look directly at the black dots that appear in the circles. Why this illusion works is still a mystery.
#1 Technically , these are not even squares, let alone being of same colour. Upper is grey with a black shadow, and lower is white with a grey shadow. So, not the same colour.