I do not know whether some other people feel the same, but sometimes, when I start using a new system or a new program which has been designed well enough to be beautiful, usable, practical etc..., I feel intelligence. The kind of system about which you can think "I don't know whether this functionality exists, but if it does, I should be able to find it there, and it should work like this...", and seconds later (without ever looking at the user manual) find exactly what you had in mind.
The feeling that an intelligence has been there. Somebody's intelligence. I find amazing to be sharing the mind state of somebody I have never met, and will probably never meet, through the fact of using something they built. I experience it as an intimate experience.