The creator often includes hidden symbols in the drawing that refer to inside jokes or other elements.

Launched January 21, 1985,[1] the panel appears daily in 350 markets throughout North and South America, Europe and Asia.

[3] Bizarro offers an eccentric, exaggerated and, as the name implies, bizarre look at everyday life.

Some cartoons involve celebrities, while others make reference to themselves or characters from comics or animation (such as Superman and Gumby).

Comics critic Tom Heintjes described Bizarro's themes, cryptic aspects and expansion into performance art: Most Bizarro cartoons since 1995 include one or more of these elements hidden somewhere in the cartoon: As of 2008, Piraro indicates how many symbols are hidden in each strip with a number above his signature.