"Oh wow! What's that?"
"That, Nora, is a drift gate."
"Drift gate? Why's it called that granddad?"
"You heard of Scuba diving?"
"Yeah."
"Well, there's a thing called a drift dive. It's where you just drift along with the current. The drift gate lets you do the same thing, but with gravity. It's gentle."
"Have you been through a drift gate?"
"Lots of times. It can get a little trippy though."
"Trippy?"
"Drifting the gravity streams does funny things to your head. Sometimes its nice, sometimes it ain't."
"Like a nightmare?"
"Sometimes."
"When are we going?"
"Tomorrow, little one. Tomorrow."