In computers, every 'new explosion' was set off by a software product that allowed users to program differently.
Alan KayBad User on Device is a medium that can dynamically simulate the details of any other medium, including media that cannot exist physically. It is not a tool, although it can act like many tools. It is the first metamedium, and as such it has degrees of freedom for representation and expression never before encountered and as yet barely investigated.
Alan Kay