Lewis and Harris MacLeod, and those on Lewis being referred to as from the clan MacLeod of Lewis. Lewis is also the ancestral home of Clan Morrison. The Lewis chessmen is a famous collection of 12th-century chess pieces, carved from walrus ivory and mostly in the form of human figures, which were discovered in Uig in 1831. A major industry on the island is the production of Harris tweed fabric, which is handmade on the island; by law only fabric produced in the Outer Hebrides can be called Harris tweed. The Lewis Trilogy of novels ("The Blackhouse", "The Lewis Man" and "The Chessmen")
Donegal fiddle tradition often than trills as ornaments, the use of double stops and droning; and the occurrence of "playing the octave", with one player playing the melody and the other playing the melody an octave lower. None of these characteristics are universal, and there is some disagreement as to the extent to which there is a common style at all. In general, however, the style is rather aggressive. Another feature of Donegal fiddling that makes it distinctive among Irish musical traditions is the variety of rare tune types that are played. Highlands, a type of tune in 4/4 time with some similarities