TIERRA DEL FUEGO. WEATHER AND CLIMATE. In spite of its incendiary name, Tierra del Fuego -as well as the rest of Patagonia- has low temperatures and strong winds, sudden changes of weather, going from strong winds to complete calm, or from sunny to rainy conditions being very common.
Theories of Color Vision. 1  In 1802, Thomas Young proposed that all human vision occurred through the combination of sensitivity to red, green, and blue. This theory, modified by Hermann von Helmholtz in 1852, came to be known as the Young-Helmholtz or trichromatic (three-color) theory of color vision.
The retinas of our eyes have a large number of light-sensitive cells. These cells are of two types. One type of cell is cone shaped, while the other type is rod shaped. They are called cones and rods respectively. The rods respond to intensity or brightness of light, while the cones respond to colours. The cones make it possible to distinguish between different colours.