According to CBS News, Mr Castro confessed to his crimes in a long, hand-written letter found in the house, which investigators believe may have been intended as a suicide note.

BBC: Ariel Castro. Photo: 9 May 2013

For him, the reason is that stories are written, not found, and once the news fades, initial excitement dies down.

FORBES: People

Many elder shadow puppetry artists can perform dozens of traditional plays, which are orally transmitted or found in written form.

UNESCO: Intangible Cultural Heritage