The elm pyramid

Wooden forms were used to teach solid geometry and mathematics in schools from the late 19th century through the first half of the 20th century. In total, there are 9 turned or crafted shapes, 9 types of wood (poplar, oak, linden, chestnut, elm, plane tree, pear tree, service tree, and walnut), presented through 9 stories to tell. Some species, like elm, are becoming increasingly rare, while others remain ever-present in our daily lives. The wood is carefully selected by artisans committed to promoting sustainable forestry and respecting the environment.