Accumulator-West Cork Arts Centre, 2012. Paul Green and Mark Cullen Wendy Judge Jessica Foley Mark Cullen and Gillian lawler Mark Cullen and Gillian Lawler Jessica Foley Paul Green and Mark Cullen Gillian Lawler Gillian lawler Gillian Lawler Mark Cullen Mark Cullen and Jessica Foley Paul Green Difference Engine Annex Gordon Cheung Difference Engine catalogue Gillian Lawler Mark Cullen, Paul Green, Gillian Lawler and Wendy Judge. Difference Engine, Annex Paul Green and Mark Cullen.