 Wong became interested in environmentalism through visiting a waste reprocessing centre in Hong Kong , and realising just how little was recycled . His works re @-@ use or recycle materials obtained from rubbish tips . In 2010 , Wong curated " Memory of the Forest " , a collection of animal sculptures by himself and 13 students made using discarded wood , which symbolises the animals ' lost habitats . Wong contributed a similar " Mega Musical Art Piece " to the 2012 Hong Kong Cleanup campaign in the form of an octopus . Wong participated in a campaign of the Ocean Recovery Alliance in Hong Kong in April 2013 , contributing Death by Amputation – a sculpture of a life @-@ sized finned shark – to an exhibition in Stanley harbour in the hope that it will provoke thought on the source of food and the cruelty inflicted by humans on animals . In 2014 , as part of an animal @-@ themed exhibition with other artists , he unveiled Ball Ball , an imposing sculpture of his one @-@ eyed cat again made of discarded wood . 
