"So how am I getting around here? Why doesn't anyone see me as I'm traveling around? What does all this have to do with compost?"
"Well, you'll notice that not even you are seeing you getting around."
"So can I travel through time?"
"You're slipping around, spacemummer. But you can't slip time. As far as you're concerned, it's a powerful stream you can't swim back up. It's a one way street. But as far as three dimensional space is concerned, you're a pumpkin seed, try to get a handle on you and blip, you're gone."
"I guess you expect me to take it for granted that you have given me a satisfactory answer."
"Use your imagination. I'm giving you visuals here."
"Oh, ok. Everything is perfectly clear." I gave up on any sharper explanations. Might make my unguent leak.