Photographer Nicky Bay was walking by the lush jungle of Singapore when he saw a glimmer moved between the branches. When bringing the camera, and make noise, the animal emitting the flash reduces glare. But when a while, the animal is relaxed, this shines again as a small diamond. It was a spider on its abdomen that contains reflective and shiny patches.
In this brilliant animal is known as "spider mirror" or "spider spangle", referring to his abdomen that resembles small mirrors. Actually the "mirrors" are flakes, which increase in size depending on the mood of the spider. If you feel threatened or reduce the size of the mirrors and thus go unnoticed. When you relax or want to be noticed, wide surface of these mirrors to see him.
They are spiders that roam the centimeter. And part of Thwaitesia gender, we find arachnid species with the same effect but different colors. Here some pictures.