The Twin Cities Marathon footrace was represented by an M.C. Escher-inspired Charles S. Anderson-designed logo for 25 years.
But since 2006, the race has been called the Medtronic Twin Cities Marathon, so this year Medtronic decided the race needed new branding. Hence the new split leaf design.
But the old logo is so beloved it's still used by the people who -- I'm guessing -- actually put on the event and get some money from Medtronic to do that.
What's interesting to me is: the old logo couldn't just be jettisoned. Sure, it's on its way out, but it's still hanging in there on this year's street banners.