Enter Ukiyo- the "fleeting, floating world" inhabited by the merchant class of Japan in the 17th to 19th centuries. Physical love as a means of self-expression as an art form has always assumed a greater importance in the East than in the West. In the uninhibited atmosphere of Ukiyo, erotic art literature was openly produced and widely enjoyed; and it was here that Japanese eroticism found its truest and most perfect in the famous wood-block prints known as the Ukiyo-e shunga.