When 'consciousness' is unawares transferred from great things to small' - which Spencer regarded as the prime cause of laughter-the result will be either a comic or an aesthetic experience, depending on whether the person's emotions are of the type capable of participating in the transfer or not. The artist, reversing the parodist's technique, walks on a tightrope, as it were, along the line where the exalted and the trivial planes meet; he 'sees with equal eye, as God of all, / A hero perish or a sparrow fall'. The scientist's attitude is basically similar in situations where he suddenly discovers the connection between a banal event and a general law of nature - Newton's apple or the boiling kettle of James Watt.