The Tultecas were careful and thorough artificers, like those of Flanders at the present time, because they were skilful and neat in whatsoever they put their hands to; everything (they did) was very good, elaborate, and graceful, as for example, the houses that they erected, which were very beautiful, and richly ornamented inside with certain kinds of precious stones of a green color as a coating (to the walls), and the others which were not so adorned were very smooth, and worth seeing, and the stone of which they were fashioned appeared like a thing of mosaic.... They also knew and worked pearls, amber, and amethyst, and all manner of precious stones, which they made into jewelry.[33] We find another statement to the effect that-- The lapidary is very well taught, and painstaking in his craft, a judge of good stones, which, for working, they take off the rough part and bring together or cement with others very delicately with bitumen or wax, in order to make mosaic-work.[34] In the pictorial section of the Florentine manuscript of Sahagun,[35] in the Codex Mendoza,[36] and in the Mappe Tlotzin,[37] are pictures delineating artisans engaged in various crafts, such as weavers, painters, carpenters (wood-carvers), stone carvers, lapidaries, goldsmiths, and feather-mosaic workers, yet we find no actual representation of turquois-mosaic workers. In the third section of the Codex Mendoza appears a picture of a father teaching his son the secrets of the lapidary’s art. The interpreter of the codex writes: The trades of a carpenter, jeweler (lapidary), painter, goldsmith, and embroiderer of feathers, accordingly as they are represented and declared, signify that the masters of such arts taught these trades to their sons from their earliest boyhood, in order that, when grown up to be men, they might attend to their trades and spend their time virtuously, counseling them that idleness is the root and mother of vices, as well as of evil-speaking and tale-bearing, whence followed drunkenness and robberies, and other dangerous vices, and setting before their imaginations many other grounds of alarm, that hence they might submit to be diligent in everything.