Michelangelo’s Sistine Chapel frescoes stand among the defining masterpieces of the Italian Renaissance but before the masterpiece, there were countless moments of study, invention and exploration. Executed in vivid red chalk, this drawing of the Libyan Sibyl’s right foot reveals Michelangelo at work — obsessively refining anatomy, balance and tension. Toes press, weight shifts, strength becomes grace. Quietly powerful, this document of the artist's process is a reminder that even the grandest v