MUSH is an abbreviation for Multi-User Shared Hallucination, it is a text-based online social medium to which multiple users are connected at the same time. Traditionally, MUSH are often used as live role-playing platforms, roleplay consists of a series of 'poses'. Each character makes a 'pose' - that is, writes a description of speech and actions, etc. which the character performs. This medium borrows traits from both improvisational stage acting and writing.