As murals, busking and other forms of street art become increasingly common in Singapore's public spaces, artists say acceptance has grown to some degree. Yet, they can't shake off the sense that such art remains carefully curated and managed. Veteran visual artist and art educator Mohammed Zulkarnaen Othman has had about 20 years of experience in the visual arts, both in Singapore and overseas.  He specialises in art with graffiti-like aesthetics, and over the years he's seen how Singapore's