Irony, satire, humor, eroticism and subversion of governmental authority are frequent characteristics of artistamps. Artists may leverage the expectation of official endorsement that necessarily inheres in governmentally-issued postage for the purpose of shocking or subverting viewers' expectations, with such actions typically representing a specific political and artistic motive. Other practitioners are content to depict more homey subjects like kittens and family members. Some artists use the form to create fantasy stamps for their own postal administrations or countries – in many cases thereby developing or complementing an imaginary governmental system.