Having a surface or boundary that curves or bulges outward, as does the exterior of a sphere, or a balloon. see thumbnail to rightConvexity is the state of being convex.Examples: Jan van Eyck (Dutch, died 1441), The Arnolfini Marriage [aka Giovanni Arnolfini and his Wife], 1434, oil on wood panel, 81.8 x 59.7 cm, National Gallery, London. see thumbnail to rightA convex mirror hangs on the wall behind the bride and groom. In this mirror is a reflection of the scene in the room. The frame of the mirror contains ten rondels which are scenes from the life of Christ. See Dutch art, frame, mirror, and symbol.