Original text - Engels - bringing up children

where one stage of child development has been left out, or not sufficiently experienced, the child may have to go back and capture the experience of it. a good home make this possible , for example by providing the opportunity for the child to play with a clockwork car or toy railway train up to any age if he still needs to do so .this principle,in fact,underlies all pyschological treatment of children in difficulties with their development,and is the basis of work in child clinics.