curious arts. Greek. periergos. Only here and 1Ti_5:13. The word means "going beyond that which is legitimate". The kindred verb only in 2Th_3:11.
arts = things.
brought . . . together = having collected.
books. These were either books on magic, or strips of parchment or papyrus, with charms written on them. Many of these have been discovered. The great magical Papyrus referred to above (Act_19:13) contains about 3,000 lines.