Play is the work of childhood.
What we see changes what we know. What we know changes what we see.
The most developed science remains a continual becoming
During the earliest stages the child perceives things like a solipsist who is unaware of himself as subject and is familiar only with his own actions.
Knowing reality means constructing systems of transformations that correspond, more or less adequately, to reality.
I have always detested any departure from reality, an attitude which I relate to my mother's poor mental health.