Transmigration was the skill of defying the laws of pure science and pulling objects out of thin air. (TV:The Ambassadors of Death)

It was practiced by students atthe Academy, despite warnings from their instructors that it misused theRassilon Imprimatur and could warp theirbiodata. (PROSE:Interference - Book One)

The Hermit taught it tothe Doctor; when theFirst Doctor revisited the hermit toward the end of his life, the Hermit transmigrated a bone-china tea set and the Doctor transmigrated a jug ofyak's butter, though it was ugly due torheumatism stiffening the Doctor's wrist. The Hermit noted that the Doctor always did better at transmigration while his hands were in his pockets. (PROSE:The Three Paths)