As Formula 1 celebrates its 1000th world championship race this weekend in China, it's inevitable that the focus will be on celebrating some of the great moments that have made the championship a global icon. But the time for reflection will not last long.
F1 has made it this far because in sporting terms it has actually wasted little time in holding on to the past. It's all been about what comes next: whether it is a team chasing a faster car, a driver pursuing his next victory or bosses chasing the next big deal.
Now though, F1 is heading towards an important period that will almost certainly decide not only its shape from 2021, but whether or not it will be sustainable in the longer term.