We created an original calendar for Okawa Printing, which is a social printing company that emphasizes environment-friendly processes. For this original calendar, we used paper made from thinned wood and environmentally friendly ink. This paper represents wood from trees, which are thinned from Japanese forests in order to protect them. For the base, we also used thinned cedar, to realize a design with low environmental impact. The thinned-wood base is cut diagonally, to allow placement of pens and other small items.