It may be written in 2000, and set in distant future. It could have been on Earth. The bit I read was about an elevator time machine doorway. This was used routinely to travel back and forth in daily life. But a renegade wanted to go as far into the future it would allow. It seemed he was getting a tour, being unfamiliar with it. The two humans stepped in, stopping a few times and briefly having a look around, seeing recognizable things and other people. They continued and went so far that objects started losing their form and colour. There was discussion between the 2 characters that they were warned of this danger, that it may affect them or the time lines, by going so far into the future. Lastly, I recall the renegade getting off the elevator and being in awe in the formless future.
This might have been a short story.