Very nice idea and good visualization, although I'd have preferred a single "switch" button to quickly switch the whole view between 2007 and 2014. While this

Very nice idea and good visualization, although I'd have preferred a single "switch" button to quickly switch the whole view between 2007 and 2014. While this demonstrates the huge progress of OSM, it is important to keep in mind that the hardest (and not so rewarding) part of the work is not to create the maps, but to keep them up to date! That's why it is important to keep supporting OSM.