Thanks for sharing! I have actually recently implemented something similar with my group of 4-5 year olds, as I am a preschool teacher. Because children of this age can't express their ideas in writing, they come to one of the teachers when they see someone doing something kind (for them or for others). They then 'nominate' the child and dictate to the teacher what the kind deed was, so that one of us can write it down on a paper leaf, then the child who witnessed the deed is given the leaf to hang on one of the branches of our 'Kindness Tree'. We read the kind deeds out during Group Times so the children's contributions will be valued and their peers will be inspired.