Te Papa’s biggest revamp in two decades has the national museum devote a third more space to art. The new Toi Art gallery spans two levels of the museum and includes works from the permanent collection and new work commissioned for the space. So will it finally do justice to the nation's art collection? Lynn Freeman invites critics Mary-Jane Duffy, head of the Whitirea Creative Writing Programme, and The Big Idea's Mark Amery to give their assessment of the new space.