Or at least I think that is what was happening here ...
on my breezy walk this afternoon I was absorbed watching this speckled wood butterfly
when I saw something swing in front of my face. Once I managed to focus on it I was transfixed, watching it hanging from it's silk thread twisting it's way higher and higher into the branches of the overhanging oak tree.
Once it reached the height of the sheltering hedges on either side of the lane the caterpillar was swinging around far too vigorously to watch anymore.