What causes optical illusion 1?

Câu hỏi: What causes optical illusion 1?

A The red dots aren’t close to each other.

B We can see the blue dots clearly, but not the red dots.

C We compare each red dot with the blue dots around it.

D We can see that the blue dots are larger than the red ones.

Câu hỏi trên thuộc đề trắc nghiệm

Reading 7B: Seeing the Impossible