Vijfhoek rond een gelijkbenige driehoek met onderaan ruïnes 1669

This etching by Sébastien Leclerc I, titled "Vijfhoek rond een gelijkbenige driehoek met onderaan ruïnes," is a geometric composition of a pentagon and a triangle superimposed. The artwork, dated 1669, is a prime example of the geometric and mathematical principles that underpinned 17th-century art. The inscription of letters and numbers within the shapes indicates a focus on mathematical precision and the relationship between geometry and nature. The ruins at the bottom of the composition suggest a sense of the past and decay, adding a layer of historical and philosophical weight to the mathematical demonstration.