There are no windows in the corners because they are occupied by load-bearing pillars.

Located on the edge of the Ring Road at La Défense 5, this matte-grey anodized aluminum tower features a hollowed-out semi-cylinder between its two sides, with the top floors cantilevered over empty space.

The two extremities bracketing the hollowed curve are slightly asymmetrical.

This tower was designed for IBM with two elevator shafts (the extremities) linked by a horizontal circulation space (the hollowed-out center).

The overhanging upper floors form exclusive corner offices reserved for the corporate directors.

A round pedestal forms the base of the tower. Its accessible parts are clad in stone.