There's three colours. Our mind works with association, the surrounding colours affect our perception of the colours present. A brown coloured guy wearing black clothes will appear fairer compared to the same guy wearing white clothes, a small circle in bigger circles will look smaller compared to the same circle in smaller circles etc. Theres pink, white and green colours present in the pic, in one area the pink is surrounded by dark green colours so it appears reddish, in the other its surrounded by white so it appears pinkish.