"Fever" contains a fragment of burned wood found in the Hayman fire zone. The drawing is animated with a short film involving a flame traveling along its length. Fire is ignited when oxidation occurs: oxygen atoms combine with carbon and hydrogen to form water and carbon dioxide. If the heat cannot by released faster than it is created, then combustion occurs. Variation of color within a flame is formed by uneven temperature. Often the hottest part of a flame glows blue at its base and the cooler parts glow orange and yellow at the top. The sodium or salts in wood produces yellow or orange emissions. The blue part often indicates that the flame is very hot and that gas molecules are glowing.