I stumbled across a patent today (it's safe to look at this one), with some interesting features for managing a queue in the real world. It's kind of invasive, but ties in well with the examples of "Red in a different light". https://patents.google.com/patent/US9965938B1/en -- Dave Täht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-205-9740