Sock and buskin are ancient symbols of comedy and tragedy. In ancient Greek theatre, actors in tragic roles wore a boot called a buskin (Latin cothurnus) while the actors with comedic roles wore only a thin-soled shoe called a sock (Latin soccus).^[1][2]

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  Sock
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  Buskin

Melpomene, the muse of tragedy, is often depicted holding the tragic mask and wearing buskins. Thalia, the muse of comedy, is similarly associated with the mask of comedy and comic's socks.^[3]