Installed in the imposing Zichy Mansion (Zichy kastély) built in 1757, this museum contains the works of Victor Vasarely (or Vásárhelyi Győző as he was known before he emigrated to Paris in 1930), the late ‘father of op art’. The works, especially Keek and Ibadan-Pos, are excellent and fun to watch as they ‘swell’ and ‘move’ around the canvas.