In Noh theatre (classical Japanese music drama), Japanese ghosts are usually
upset females. Portrayed without feet because they have lost their connection
to the earth, they are so filled with love, jealousy or rage that they won't
go peacefully into the night. Japanese believe ghosts are people who have
died with an unpaid on — “debt” or “obligation.” If not repaid, the
debt is passed down for generations, growing with each one like a snowball
into an avalanche. Whole families, villages, countries can live under the
dark cloud of an "on". By then, nobody knows how to fix it.