Hall of Infinite Doors

You enter the Bone Door. To your dismay, those aren't plastic mold replicas as you had hoped. But you don't have all that much time to think about this fact, because you find yourself in a classroom.

"Alright, class, today's topic deals with the seemingly impossible." The professor's voice seems calm and relaxing, and his piercing blue eyes seem to sparkle with kindness.

"Consider this table," he says, tapping it with his fist. You look down at it long enough to recognize that, yes, that sure is a table, before you redirect your eyes back to the professor. He's just so captivating...

"Let's say I remove a molecule from this table. Follow me?" You nod in agreement. "Now let's say I remove another molecule. It's still a table, right." You nod again. This makes so much sense! "Now let's say I keep removing molecules, time and time again. When will it stop being a table?"