this book is titled "kinobori no uta"- poem of tree climbing....symbolic activity as a child.
there are collective poems and essays related to his birth town tsuwano, shimane, japan. it is actually 2 hour drive from where i live and i often go there as school excursions or day trip and he used to teach at university where i live... it is a lovely hidden town surrounded by mountains where many writers and artists were born in its history.
this book is just so fun to just look! everything is written in japanese but as his generation his japanese is a bit like grandfather's and he wrote all with pencils by himself so the whole atmosphere of this book were kept private and special.
there are 2 other books in this style of story telling. if you search on amazon for "anno mitsumasa", you will find many books! for his biography, click his name on the first paragraph.