The image is a photograph of an open notebook with a handwritten note on the left side. The note is written in black ink and appears to be a list of notes or notes. On the right side of the notebook, there is a diagram of a circular structure with arrows pointing in different directions. The diagram is labeled with the names of the different parts of the structure, such as the top, bottom, and top. There are also some notes written in blue ink on the notebook. The notebook is resting on a wooden surface.