With the exception of cars, when we buy and use objects that are faster than their predecessors, we typically get used to the new speed quickly, and our perceptions of swiftness start to degrade. To the point where I no longer have any sense of how slow my first iPhone (the original) was compared to my current (the 4S). So it's kind of neat to see this video by EverythingApplePro, where they took every iPhone model ever made and laid them all side-by-side for a realtime speed comparison:

It's also interesting to see just how dated the first iPhone, the technological marvel of 2007, looks here in 2013; the iPhone's industrial design has come a long way. (So has this video—it went live over the weekend and already has two-million-plus hits!)