When I started off in electronics, it was the heyday of lead through-hole technology. I used to love all the colors associated with various components, such as the colored bands on the resistors shown below.
It wrote in a September blog post: “When I’m building a circuit, if I have a selection of capacitors (for example) of the required type and the same value but of different shapes, sizes, and colors, then I will select the one that best matches, complements, or contrasts the other components on the board.”
Of course, quite apart from their aesthetic qualities, the colored bands on the resistors served to distinguish their values, tolerances, and so forth. This is particularly useful when you are a hobbyist, because you are constantly hunting for parts in your component treasure chest.