recursion
Hofstadter's Law
An Idea by Douglas HofstadterIt always takes longer than you expect, even when you take into account Hofstadter's Law.
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Gifts and occupations
Between 1835 and 1850 Froebel worked on his “Gifts and Occupations” — a set of geometric blocks (Gifts) and basic craft activities (Occupations), that would become the centerpiece of his pedagogical theory. The Gifts and Occupations were introduced in a highly ordered sequence, which began in the child’s second month and concluded in the last year of kindergarten.