Inside the framework is made of strong steel. Special infrared photographs of the body are called thermograms. The thermogram pictures show a 'heat picture instead of the 'light picture'. The photograph is printed in visible colours so that we can see what is in the picture. These show up diseased parts because diseased parts radiate less heat than healthy parts.
Thermograms show body temperatures clearly.
The hottest parts look white, the next hottest are red, then they pass through orange, green and blue down to the coolest areas which are purple. A mirage is a type of optical illusion. It generally appears in a desert. The heat makes the light rays refract as they pass from cool air down to the hot air near the ground. The rays from the cloud create a mirage on the sand.