Nurikabe

A Nurikabe is a legendary creature from Japanese mythology that was envisioned as an invisible monster that often took the form of a ghostly wall and used its mass to trick travellers wandering lonely roads, blocking their path and generally causing mischief in a similar manner to spirits such as Will O The Wisp in Western culture. The Nurikabe is one of countless such beings that make up the complex mythology of Japan - which arguably has one of the widest array of monsters, demons and spirits in the world: many of which were considered alien by human standards in appearance and behavior.

The Nurikabe have also appeared in many media due to the popularity of Japanese mythology - one of the more notable examples is the Whomps from Super Mario Bros, which are a modified version of the Nurikabe myth.