This lecture explores the way in which artists over the centuries have included transparent glass objects in their paintings, taking huge delight in capturing the shadows and reflections seen within the glass as well as displaying their skill in portraying what lies behind and beyond. It will include the remarkable depiction of glass objects in Roman wall-paintings, works by artists such as Titian, Veronese and Caravaggio – where both the Gods of Olympus and the disciples are seen drinking out of fragile Venetian cristallo – and the proliferation of glass drinking vessels in Dutch still-life paintings.