Some plants and vines spiral clockwise as they go along (right direction) and some spiral anticlockwise (left direction). What determines which direction they spiral along? At first, I believed it to be determined by which hemisphere you are in (influenced by the Coriolis Effect), and this result could be tested by finding spirals in both northern and southern hemispheres and comparing their directions. However, the very first spiral I found seemed to cripple that idea.
The spiral I found spirals first in the right direction, then suddenly decides to spiral in the left direction, and then further along in the right direction again. Since the Earth does not arbitrarily change its rotational direction, this phenomenon must be explained by some other explanation. The change in rotational direction seems to be abrupt, almost like a catastrophic event. A few that I thought of:
1: Arbitrary. The spiral seeks merely to latch onto something, and will try both directions to see if either work out.
2: The spiral is somehow influenced by the night day cycles. Since the spiral switches from right to left back to right having been subjected to two sudden changes, the only large changes I can think of is the day night cycle.
I live in Australia, by the way.