This is the result of luck and "playing" with the weight of one of the triangles in Apo.
The full size image can be enjoyed at the preceding link.
Today's Gratitude Item: That my students only broke one boiling tube whilst doing an experiment which involved the thermal decomposition of a metal carbonate. My colleague's class managed break at least three of them in one session. Turns out those boiling tubes are not as resilient as we would like them to be.