Piper, Finn and others in “InFinnity”

They're not holograms, not pods, not made of metal or paper-maché. They're real-live exact duplicates.

[looking at a clone] Hey, is my left nostril really bigger than my right? And why didn't someone tell me I had a hairy mole on the back of my neck?

At least I'm a fresher, newer you, old-timer!

Hey, do not mess with the master copy, clone boy!

Same exact personality, too.