Episodes in another diary reveal the importance attached to properly matched shades: _It is dawn and a woman is lying in bed after her lover has taken his leave. She is covered up to her head with a light mauve robe that has a lining of dark violet. . . . The woman . . . wears an unlined orange robe and a dark crimson skirt of stiff silk. . . . Near by another woman's lover is making his way home in the misty dawn. He is wearing loose violet trousers, an orange hunting costume, so lightly coloured that one can hardly tell whether it has been dyed or not, a white robe of stiff silk, and a scarlet robe of glossy, beaten silk.2 _ This interest in the colors (and textures) of materials remains a Japanese characteristic to this day, perpetuated by Zen and post-Zen aesthetes, who sensibly realized that this outgrowth of their culture surpassed that found anywhere else in the world. As may be gathered from the passage above, celibacy was not part of the fashionable world of Heian Japan. Marriages were sanctioned only after the sexual compatibility of the couple had been established, a ritual carried out by a young man calling at a young lady's quarters for several nights running before officially announcing his intentions to her parents. The secret visits were, of course, secret to no one, and at times a young lady might initiate the test by an open invitation. Such a letter also allowed the man to judge her handwriting in advance and thus not waste his time courting a girl wanting in accomplishment. The following diary passage reveals the curious Heian association of penmanship and sex: _I remember a certain woman who was both attractive and good-natured and who furthermore had excellent hand-writing. Yet when she sent a beautifully written poem to the man of her choice, he replied with some pretentious jottings and did not even bother to visit her. . . . Everyone, even people who were not directly concerned, felt indignant about this callous behavior, and the woman's family was much grieved.3 _ In a society where brushwork was a primary test of social acceptability, it is not hard to find the roots of Japan's later great age of Zen monochrome painting, for, as Sir George Sansom has pointed out, to write beautifully is to solve certain fundamental problems of art--particularly when that writing is executed with the brush. The writing materials used by Heian courtiers and the calligraphy they set down became important tools for the Zen arts. Writers made use of what the Chinese called the "Four Treasures": a brush of animal hair or bristle, a block of solid ink made of lampblack and glue, a concave inkstone for grinding and wetting the dried ink, and a paper or silk writing surface. These materials are all thought to have been introduced into Japan by a Korean Buddhist priest sometime near the beginning of the seventh century, but they already had a long history in China--possibly as much as a thousand years.