Time Magazine coined the term op art in 1964, in response to Julian Stanczak's show Optical Paintings at the Martha Jackson Gallery, to mean a form of abstract art (specifically non-objective art) that uses optical illusions. Works now described as "op art" had been produced for several years before Time's 1964 article. For instance, Victor Vasarely's painting Zebras (1938) is made up entirely of curvilinear black and white stripes not contained by contour lines. Consequently, the stripes appear to both meld into and burst forth from the surrounding background. Also, the early black and white "dazzle" panels that John McHale installed at the This Is Tomorrow exhibit in 1956 and his Pandora series at the Institute of Contemporary Arts in 1962 demonstrate proto-op art tendencies. Martin Gardner featured op Art and its relation to mathematics in his July 1965 Mathematical Games column in Scientific American. In Italy, Franco Grignani, who originally trained as an architect, became a leading force of graphic design where op art or kinetic art was central. His Woolmark logo (launched in Britain in 1964) is probably the most famous of all his designs.