We can’t take our eyes off this watchtower

Lech Kulina has achieved some real sorcery with this medieval watchtower. Its near-perfect cylindrical shape is an illusion, achieved by creating a 16-sided polygon that approximates a curve to the naked eye.

The Watchtower

Lech was nice enough to give everyone a look at how it was done with some helpful cross-section pics. Although, to me, it still looks like magic.

The Watchtower - Three main sections from the top

The Watchtower - Wooden superstructure and roof