https://www.reddit.com/r/antinet/comments/z3f8kb/oblique_strategies_a_custom_zettelkasten_for/
Brian Eno and Peter Schmidt published a card index of un-numbered and purposefully unordered ideas in 1975 as a tool for increasing creativity. They called it "Oblique Strategies". Each card contained an aphorism for helping one to reframe their approach to problems or questions they faced.
Black box with cards containing aphorisms to help increase creativity. Photo by V&A Images from the David Bowie Archive.
Wikipedia: https://en.wikipedia.org/wiki/Oblique_Strategies<br /> Canonical site with complete list of versions: http://www.rtqe.net/ObliqueStrategies/OSintro.html
ZK practitioners might profitably have a subsection in their box with these strategies to help themselves randomly increase their own creativity while working either inside or outside of their boxes. Potentially useful for writing, music, art, etc.