Playfullness is the essential feature of productive thought. Albert Einstein
Combinatory play seems to be the essential feature in productive thought - before there is any connection with logical construction in words or other kinds of signs which can be communicated to others. Albert Einstein
It affords an immediate step, however, to associative indexing, the basic idea of which is a provision whereby any item may be caused at will to select immediately and automatically another. This is the essential feature of the memex. The process of tying two items together is the important thing. Vannevar Bush
If there was never any difference between the value of commodities someone desired to sell and buy on the market, then no-one would ever desire to accumulate wealth. But an essential feature of capitalism is the existence of a group of agents with precisely that intention. Steve Keen
'Solutionism' for me is, above all, an unthinking pursuit of perfection - by means of technology - without coming to grips with the fact that imperfection is an essential feature of liberal democracy. Evgeny Morozov