More than 8,000 tennis balls, 10 days, one place to be this January. David Shrigley’s Tennis Ball Exchange is coming to Melbourne for Triennial EXTRA. Be a part of this interactive installation by contributing a ball and trading it for another to take home with you. Over time, the shelves of fresh new tennis balls will be replaced by Melbourne’s donated ones – scribbled over, slobbered on, branded and bedazzled. Make your mark with a one-of-kind contribution to David Shrigley’s Melbourne Tennis Ball Exchange, only at NGV this summer.