This is the recording I used to make invisible map # 1. This was made on my phone close to where I live in a small area of woodland overgrown with tall poplar trees , small oaks and a lot of grass and undergrowth. These small pockets of wilderness between fields sustain the populations of migratory birds.
This recording was made at 5.45 am on May 2020. I hope to make a recording every year around the same time and place. I turned the sonograms into 24 wood cut panels which form this script.