A nail hole in the Last Supper's table marks the vanishing point of its perfect perspective

Leonardo da Vinci painted The Last Supper on the north wall of the refectory at Santa Maria delle Grazie in Milan between roughly 1495 and 1498. Rather than a traditional fresco, he used a dry-wall technique that allowed him to rework the surface — but which also caused the paint to begin flaking within his own lifetime. The mural has been restored repeatedly, most recently in a campaign that ended in 1999. ^[1][2]

One vanishing point, at Christ's temple

In one-point perspective, all receding parallel lines in a scene — the orthogonals — converge at a single vanishing point. Leonardo placed that point at the height of Christ's right temple, which is also the exact center of the composition. The result is that the room's ceiling coffers, the tapestries on the side walls, and the edges of the table all funnel the viewer's eye toward Christ's face. ^[3]

Art historians have long noted a physical trace of the method: a small nail hole in the table, at the point where the orthogonals meet. It likely served as the fixed reference Leonardo used to lay out the perspective grid, and it survives as a rare, direct mark of the mural's geometric construction. ^[3][4]

Why the geometry matters

• The vanishing point is not arbitrary: it coincides with the center of the composition and with Christ's head, making the theological focus and the pictorial structure the same point. ^[3]
• The side walls and ceiling recede according to the same scheme, so the painted room reads as a believable extension of the actual refectory. ^[3]
• The nail hole is one of the few surviving physical traces of how the perspective was laid out on the wall. ^[4]

A fragile masterpiece

Because Leonardo did not use true fresco, the painting deteriorated quickly; by the mid-sixteenth century it was already described as damaged. Later restorations removed earlier repaints and stabilized what remained. Today it is protected behind a climate-controlled system and can only be visited in small, timed groups. ^[1][2]

The nail hole is easy to overlook in reproductions, but it is a reminder that the mural's calm, balanced space was engineered with practical measuring tools — a physical point on the wall that fixes the entire scene. ^[3][4]