Every really good creative person…whom I have ever known has always had two noticeable characteristics. First, there was no subject under the sun in which he could not easily get interested-from, say, Egyptian burial customs to modern art. Every facet of life had fascination for him. Second, he was an extensive browser in all sorts of fields of information. For it is with the [creative] man as with the cow: no browsing, no milk.
James Webb Young, writing in his 1939 guide to producing ideas, articulates a timeless truth about the relationship between curiosity and creativity.