Etienne-Jules Marey (1830-1904), Photographer of Fluids exhibit (2004/2005) at Musée d'Orsay.

Scientists at the U.S. DOE Ames Laboratory have developed a silver-based, mesh-like material with a negative index of refraction:

Metamaterials, also known as left-handed materials, are exotic, artificially created materials that provide optical properties not found in natural materials. Natural materials refract light, or electromagnetic radiation, to the right of the incident beam at different angles and speeds. However, metamaterials make it possible to refract light to the left, or at a negative angle. This backward-bending characteristic provides scientists the ability to control light similar to the way they use semiconductors to control electricity, which opens a wide range of potential applications.