Show audiences an empty box. With the magician's  glimpse to the bos, a flame emerges in the box suddenly. But it disappear again mysteriously.(the flame can disappear at your will )The magician show the empty box to audiences again.  A large silk appears from the box. Pull out the silk from one corner of the box.

All this has happened before audiences. The silk and the box burn suddenly at the  staring of the magician. The audiences watch the appearance and the disappearance of the flame themselves.

A full set includes a fire box and a silk.