ITHACA

"What selfevident enigma pondered with desultory constancy during 30 years did Bloom now, having effected natural obscurity by the extinction of artificial light, silently suddenly comprehend?
Where was Moses when the candle went out?" (U17.2067)

A similar riddle/puzzle on a PC from 1906. The answer reads: 'Because he goes out at night when he should not'.