Inventing the Wheel
They could only ever imagine the next tiny step. Anything else would have been too much of an abstraction.
What We Think With
Knowledge is a background of consciousness which gives meaning to the stream of sense-impressions that impinge against it.
Once More Unto the Understanding
It is not a given, once we turn a rigorous, scientific eye to the question, that the difference between 'knowing' and 'understanding' matters at all to the study of learning.