A Pencil Disappears And Is Replaced By Other Matter

A magic trick can be made to look all the more convincing if everyday items are used to create the mystery.
A magician places a pencil into a metal tube, and seals it with a cap.
The tube is then held by a spectator while the magician makes a magic pass.
The spectator can then remove the cap and examine the contents.
Strangely, the pencil has vanished, and in its place is a trail of star-dust.