Round and round

I'm quite preoccupied at the moment. It must seem odd but I'm thinking about thinking. The thoughts are all swilling round. I latch on to one of them, and then the lateral thinking kicks in, all the things that are connected with the thing I'm thinking about. One thought triggers another, and so it escalates. Most of the time I seem to manage fairly well. Other times it can be both trying and exhausting. It becomes a barrier to getting anything done. Never mind. I'll just hang on and let it run its course.