A smart solution is often the kind of solution that is obvious after the event. If only I'd thought of that myself'. Simple solutions are anything but dumb. Smart architecture is beautiful and elegant. In the same way that a good solution for a mathematical theorem can be beautiful and elegant.
Smart architecture is optimistic and cheerful.
There is always something pleasing about it and often it's even witty. Nor does it have to be expensive. Smart architecture is architecture with a smile - and a sincere one. This does not only apply to the physical environment - the climate, the urban landscape etc. It is also true for the social environment, for the political and historical context.