So for the first time tonight I heard the term "box jumper"

This was used by a magician in a derogatory manner. I assume it implies something ...

Nonetheless, I have recently had a positive experience with who I presume would be considered a "box jumper" ... with Harry Blackstone (Sr). In his day, his stature as a magician was such that the (Senior) was never actually required.

Here's a link to her page ... Perhaps the last living member of Blackstone's show: http://elusivemoth.com/