Presents come in boxes, as they used to, and they hold surprises, that, when opened come to light (and are no surprise anymore). We all live in a framework of references, a book of rules that governs our behaviour. In this environment, creativity has little chance. Instead, architects,should have an open mind, and should have the ability to make thoughts that go beyond the written rules, and that are so to say "out of the box". Taking the helicopter view, stepping beyond the borders of the system that is so familiar to us.
The following video is such an out of the box experience, when pop music and opera come together in the early 90s; I am sure you will remember "Barcelona".
And if you ever have a chance to visit this city in Spain and Catalunya, please take the Gaudi tour, not omitting Park Guell. Such inspiration !
F. Mercury and Caballe, Barcelona for video click here.
Some books in this area are "A whack on the side of the head", "Who moved my cheese" and the books by Edward de Bono. These all have to do with lateral thinking (as opposed to linear or analytical thinking).
In philosophy, a good example of "out of the box" or "open minded", is given by Plato, in his narrative from his work "Republic", which is known as "The Cave".