For many people, the effect is larger when they see the figures with a distance of more than 1 meter. In my knowledge, more than half observers see red in front of blue when the background is black, while about 20% see blue in front of red.

There appear to be blue holes. The effect is strong when the image is seen from apart. Moreover, dots of the circumference of each hole appears to be purple-red, though they are the same red as the surrounding dots