This book offers a set of eleven discipline-specific chapters from across the arts, humanities, psychology, and medicine. Each contributor considers the creative potential of error and/or ambiguity, defining these terms in the particular context of that discipline and exploring their values and applications. Themes include error in choreography, poetry, media art, healthcare, psychology, critical typography and mixed reality performance. The book emerges from a core question of how dance research and HCI can inform each other through consideration of error, ambiguity and 'messiness' as methodological tools. The digital age had heralded the possibility that error could be eradicated by the logic of computers but several chapters focus on glitch in arts practices that exploit errors in computer programmes, or even create programmes specifically to produce errors. Together, the chapters explore how error can take us somewhere different or somewhere new, to develop a new, more interesting way of working.