Use on playground as a Discovery center that holds sand, water, gravel etc.
"Pedras Pintadas," page 12 Original title "Bemalte Steine," 1973. Written and illustrated by Doris Epple. Photos by Toni Schneider. Translated by Wanda Ramos. 2nd edition. Published in Portugal in 1976 by Editorial Presença / Martins Fontes.