Every Cloud Has Its Own Name is a collection of poems and essays of Cai Tianxin, a renowned Chinese poet, traveler, photographer and mathematics professor. "Travelers are those trying to gain inspirations and enlightment through spacial movements". Inspired by both his outer and inner journeys, Cai Tianxin wonders in his world of emotional geometry, fascinated by the changs of perspective, builds a small universe of space, feeling and sensuality. "Mathematics is like a true language, which not only records and expresses ideas and the process of thinking, but also creats itself through poets and writers. It could be said that mathematics and poetry are the freest intellectual activistes of human beings. " ----Cai Tianxin