Ztohoven is a Czech artist collective known for its artistically motivated pranks. The group consists of a core of around 20 regularly active artists, rising to around 100 when additional participants are called upon for a particular task. The group aims to use familiar tools and methods to challenge public perceptions of society. Members of the group are anonymous, and use pseudonyms when appearing or commenting in public. Many of the names used by the group's members are puns, some of which (e.g. Roman Tyc, Dan Gerous or Ana Ward) are chosen to work in English as well as Czech.