There's been some chat in the past week about zero points and how they differentiate from plane bends and even whether they do so at all. Here's my take on the concept (which, rarely enough for poi seems to be very internally logical ;) and how one can think of plane changing as being something of a sliding scale where on one end the poi stops moving (zero point) and on the other the hand stops moving (orbing).
You are missing some Flash content that should appear here! Perhaps your browser cannot display it, or maybe it did not initialize correctly.