There must be a simple psychological explanation. And the best suggestion is, I believe, Havelock Ellis’. The mind is like a two-storey house; above, the sense-impressions of the moment; below, memory. Only sometimes sense-impressions tumble straight downstairs without our being aware of their reception. They tumble straight into the memory. And a moment later — while virtually the same sense-impressions are being received in the normal way — they rise up with the quality of memories and jostle with what is actually happening about us. The result is the uncanny feeling that what is confronting
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