Astral projection

Astral projection is the ability to project one's spirit from their physical form to travel the spirit world and manifest in a temporary physical form elsewhere, either in the same form as the spirit's original form or in a different form altogether.

Mainstream Smurfs Media
The technique of hypnokinesis is a form of astral projection that was used in both the comic book and animated versions of "The Smurfs And The Magic Flute", when Sir Johan and Peewit wanted to travel to the land of the Smurfs to get their help in retrieving the magic flute that was stolen from Peewit by Matthew McCreep.