The National Portrait Gallery's new exhibition Cézanne Portraits, which opened on October 26th, is getting 5-star reviews for its wonderful collection of paintings brought together from galleries and collections around the world, some of which haven't been seen in the UK before. The exhibition draws on the expertise of Paul Smith, a leading authority on Cézanne, both for his lecture 'Sit like an apple': painting people as if they were things (in the Late Shift Talks and Lectures series, 30th November, tickets from NPG), and also for an innovative new idea that allows you to take an expert with you around the exhibition.

Visitors to the exhibition can pick up an app for their smartphone that goes far beyond the usual audio guide. This app bridges the gap between the expert and the gallery visitor and lets Prof Smith share his expertise about the paintings. He shows visitors how to experience the artist's vision, and use of colour, and how to understand Cézanne as the painter he was.

Paul Cézanne, Boy in a Red Waistcoat, 1888-90. National Gallery of Art, Washington DC.