As I’ve been absorbing more Lego culture, I’ve become interested in how to capture the essential elements of an object in a model. From experience we carry some of these essentials in our minds. For example if I say to you ‘chair’, you form an image of a chair in your mind. It probably is an object for humans to sit on, likely it has a back and four legs.
Young children’s play and conversation is busy with learning the classification rules that build up this a posteriori knowledge. A baby may form the rule that all animals are ‘cat’ but then this rule is refined as they use it and are corrected.