All you have to do is look around. People think of time machines as huge devices or Deloreans. If you think about it in the sense that light travels through time and think about stars or even the moon. When you see the sky from earth, you are seeing light that has already traveled. Although this doesn't exactly coincide with the popular definitions, I enjoy this idea because it makes me feel like I get to live outside of time when I look at the sky. Similar ideas can be said of the sun, although I would not advise looking at the sun directly. :P