The earliest print images are mostly of a high artistic standard, and were clearly designed by artists with a background in painting (on walls, panels or manuscripts). Whether these artists cut the blocks themselves, or only inked the design on the block for another to carve, is not known. During the fifteenth century the number of prints produced greatly increased as paper became freely available and cheaper, and the average artistic level fell, so that by the second half of the century the typical woodcut is a relatively crude image. The great majority of surviving 15th-century prints are religious, although these were probably the ones more likely to survive. Their makers were sometimes called "Jesus maker" or "saint-maker" in documents. As with manuscript books, monastic institutions sometimes produced, and often sold, prints. No artists can be identified with specific woodcuts until towards the end of the century.