Arie van 't Riet is a physicist specializing in low energy X-rays. A few years ago he started to use this experience in X-ray photography or in other words, looking with X-ray eyes to nature. Using his X-Ray camera, he documents animals in their natural surrounding - a butterfly nearby a flower, a fish in the ocean, a mouse in the field, a bird in a tree and so on. Take a look at some of his amazing photos on his Instagram page.