This is a mix-match book published in 2016 in France for Amaterra. The child can create almost 100 characters using the 14 ones that I created.
This book has been shown at the exhibition Giro Giro Tondo – Design for Children at Triennale Design Museum.
http://www.triennale.org/en/design_museum/tdm10-giro-giro-tondo-design-for-children/