Art of wall in Shanghai demolition area
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Graffiti art among the rubble in Shanghai, China

29 January 2015 Last updated at 17:51 GMT

Demolition in China is often a sensitive, political subject, touching on the relative powerlessness of local residents in the face of omnipotent local officials.

And while Shanghai has retained more of its old architecture than many Chinese cities, the relentless pace of economic development has still swept large parts of it away.

A few months ago, colourful, poignant paintings began to appear amid the rubble on at least two building sites, as John Sudworth reports.