theory (n.) 1590s, "conception, mental scheme," from Late Latin theoria (Jerome), from Greek theoria "contemplation, speculation; a looking at, viewing; a sight, show, spectacle, things looked at," from theorein "to consider, speculate, look at," from theoros "spectator," from thea "a view" (see theatre + horan "to see," possibly from PIE root *wer- (4) "to perceive" (see ward (n.)).
Fall of the Tower of TAR (Dualismus)
as witnessed by the theoros,