". . . these expressions (including Scandinavian tro, English true, German treu, Old Prussian druwis. . . and others) go back to an ancient Sanskrit word still in existence: dhruwa. . . which means firm, reliable, trustworthy, and generally something permanent. Now as the root tro, troi, tru has taken on the meaning of turning, dallying, revolving, dancing, in German, Celtic, Latin, and Greek, and Troi and Troyer also mean 'dance' in Old Germanic. . . ." - Otto Rank Art and Artist