Thumbs action

Evolution of culture in 2000 years

Roman circus crowd thumbing down the life of a gladiator = instant death penalty (2000 years ago)
[painting : Pollice Verso (1872) by Jean-Léon Gérôme : exposition au musée d'Orsay]

Le Pouce de César Baldaccini (1965)

Gene Siskel & Roger Ebert's Two Thumbs Up® registered trademark phrase (since 1982?)

Facebook brain-less criticism : mouse-click your way through culture (since 2006)

Know your symbols ! it's called History