Up in the hills about three miles from the mid-Wales village of Ceri, there's a stream. It runs down into the valley mostly parallel to a road. The landscape is largely uninhabited. It's a very peaceful spot. To make this recording we had to push through thick brambles and climb down into a dell where the stream flows bright and shallow over worn stones. Sheltered within steep banks ankle-deep with dry leaves and beneath budding trees, the stream flows with a crystal clear clarity. We left the microphones to record overnight (see also episodes 13 and 21). This is the hour from about 3 to 4am.  All the birds are asleep, except for a pair of tawny owls that can be heard calling to each other at the beginning. Cars occasionally pass up on the road in front, a reminder that there is an outside world beyond the perfect stillness that exists within this hidden dell. It is rare to have captured the sound of nothing happening.