This workshop is inspired by the work of the French normal school teacher Jules Dalséme (1845-1904) and is addressed to primary and lower secondary school teachers (future and in-service ones) Dalséme’s « Éléments de Takymétrie (géométrie naturelle) »: à l’usage des instituteurs primaires, des écoles professionnelles, des agents des travaux public, etc (1880) presents an original way to teaching geometry to children, going beyond the simple numeracy and proximate to synthetic Euclidean geometry. His goal was to encourage and make science more accessible for everybody, in the spirit of the intentions of the French Third Republic state education. Participants were engaged in hands-on activities taken from the educational aid Matériel-Atlas (1882), to calculate the volume of an object commonly found in construction sites.