People's memories are maybe the fuel they burn to stay alive. Whether those memories have any actual importance or not, it doesn't matter as far the maintenance of life is concerned. They are all just fuel. Advertising filler in the news paper, philosophy books, dirty pictures in a magazine, a bundle of ten-thousand-yen bills; when you feed them to fire, they are just paper. The fire isn't thinking 'oh This is Kant' or 'Oh This is Yomuri evening edition' or 'Nice tits', while it burns. To the fire, they are nothing but scraps of paper. It is the exact same thing. Important memories, not-so-important memories, totally useless memories : there is no distinction — they are all just fuel
After Dark