Soon there will be a transition from kindergarten to school
Stones are "like children" Some dotted, some striped, some plain and various colours. AND they all have different shapes.
They also come from the same shore and share a common environment. Everyone is different and unique.
The children will each get theirs at a solemn celebration. Name and descriptive adjective about each individual will be written on. This in memory of the time in kindergarten and a belief in one's knowledge and skills.