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When Beth Sellars notices that an artist she's invited to Suyama Space is making something that doesn't really work in the gallery, what does she do?

How involved should a curator be in the formation of new works?

Is it possible to compare the work that curators do with the work that artists do?

Four curators tackle these and other questions in a roundtable on this week's In/Visible: two independent (Suzanne Beal and Jim O'Donnell), and two attached (Sellars at Suyama Space and Jess Van Nostrand at Cornish College of the Arts).