This fullness of detail is important in tapestries and is the source of much of their richness and charm. The great periods of weaving made lavish use of an amazing variety of incidents and effects: the pattern of a gown, jewels, the chasing or relief on a piece of armor, bits of decorative architecture, carved furniture, and the numerous household utensils, quaint in shape or suddenly vivid in color--all these, with the innumerable flowers, the veritable menagerie of beasts, real and imaginary, gayly patterned birds, as well as rivers, groves, and mountains, make up the properties with which the designer fills his spaces and creates a composition of inexhaustible resource and delight. So with flat figures, strong outlines, deep, pure, and simple colors, a flattened setting, and a wealth of details, the artist can make a tapestry that will be at the same time both a representative and an expressive illustration, an architectural wall decoration, and a sumptuous piece of material. But even then he has not solved every difficulty; for the tapestry cannot be merely beautiful in itself. It has to serve as a background for a room and for the lives lived in it; so it must be consonant in color and line quality with the furniture current at the time it is made, and it must meet the prevailing interests of the people. Moreover, while it must be rich enough to absorb the loitering attention, it must also have sufficient repose and reserve and aloofness not to intrude unbidden into the eye and not to be too wearyingly exciting--and this last was sometimes no easy problem to solve when the designer was bidden to illustrate a rapidly moving and dramatic tale. Sometimes, in truth, he did not solve it, but sometimes he employed with subtle skill the device of so dispersing his major points of action that until they are examined carefully they merge into a general mass effect.