The Thinker by Rodin

The world's most famous sculpture of someone having a really hard think/Statues & Monuments

Auguste Rodin's The Thinker was originally conceived in 1880 as part of a larger work called The Gates of Hell, depicting Dante contemplating the inferno below. The most famous full-size bronze cast stands about 1.86 meters tall and weighs roughly 680 kg. Over 25 authorized bronze casts exist worldwide, making it the most reproduced serious sculpture in history and the unofficial mascot of philosophy departments everywhere.