It is searching for light. On a side note, I once read about some strange behavior the Devil's Ivy/Photos vine can exhibit. It is native to very dark, dense tropical forests. The seeds fall onto the floor, sprout and the vine grows searching for light. Sometimes it is unable to get through the canopy and find enough light. Then it does an interesting maneuver, it grows towards the dark (the forest floor.) Then more dark (trunk of a different tree.) Then it starts all over growing toward the light again. I have seen this behavior happen in people's living rooms. Gene
