I realise now that the good lady who taught us (in kindergarten) had had an orthodox Froebel training, and was at that time amazingly up-to-date. I can still remember almost all the lessons in detail, but I think what thrilled me most was the discovery that yellow and blue paints made green.
Source: The Autobiography of Bertrand Russell, v.1 chap. 1
More info.:
https://russell-j.com/beginner/AB11-220.HTM