The comedy/tragedy theater masks represent performing arts broadly, but online they're a favorite for signaling two-facedness or hiding true feelings — 'putting on a mask' social commentary, or captioning drama with someone acting fake. The dual-mask design dates back to ancient Greek theater tradition, one of the oldest real-world references baked into any emoji.
Keywords: actor, actress, art, arts, entertainment, mask, performing, theater, theatre, thespian