My eldest child (7) is in a Montessori school, so I was amazed when I found these today. I am smitten with them. These old education tools which were designed to teach children the motions for writing letters, Montessori style.
In these vintage motor letters, the circular knob moves cleanly around each shape, which is cut out to reveal red or green beneath. Unusual and wonderful. I'd love some for child no2.