Just this last weekend. I was coming down from a very trippy high (hadn't smoked in months). Sitting in a car, driving through the mountains... and it was dawn. The clouds were incredible. They took on a 2-d kind of feel, like paper cutouts. Their edges were golden, because of the sun, and they looked incredible. And then later, I could look at ANYTHING, especially clouds, and form pictures. It would take a while to change the picture, like my brain was putting together a puzzle, but then "snap" and what used to be clouds that looked like a smiling face, now looked like a city...
That first sativa high is really something that we should all do more often. The tolerance removes so much from the expirience, and the indica clouds everything. But the first sativa.... You have dipped your mind in ethereal wonderland.