With a disarming innocence, he would question apparently obvious assumptions, drawing distinctions so subtle that they escaped more conventionally brilliant minds.
Rather than raise fares, airlines began charging for services that had been free, from the obvious (baggage handling) to more subtle (standby travel on an earlier flight ).
The three different sizes of live tiles on the start screen is the obvious change, but there are more subtle changes inside the core applications and in the underlying code that developers work with.
This points to a less obvious consequence of Mr Modi's triumph: a subtle shifting of the terms of India's political debate, in which an ugly extreme moves ominously close to the centre.