At the turn of the millennium, public art was an established global art genre with its own professional and critical discourse, as well as constituencies of interest and patronage independent of mainstream contemporary art. Art criticism has been prodigious regarding public art’s role in the ‘beautification’ of otherwise neglected social space or in influencing urban development. Diversity and differentiation are increasingly the hallmarks of public art worldwide, emerging from city branding strategies and destination marketing as well as from artist activism and international art events and festivals. The first decade of the 21st century demonstrated the vast opportunity for creative and critical ‘engagement’, activism, social dialogue, and cultural co-creation and collective participation. New public art forms emerged, seen in digital and internet media, pop-up shops, and temporary open-access studios, street performance, and urban activism, as well as architectural collaborations in landscape, environment or urban design.