Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Vary
Ever varies, she can pass from gay to severe, from fancy to sciencequick as thought passes from the dance of a leaf, from the tint of a rainbow, to the theory of motion, the problem of light. Edward Bulwer-Lytton
The color also of this mixture varies in proportion to its degrees of heat and coldness; as a burning coal, when it is hot, shines; and when it is cold, looks black. Robert Burton