They decided to pay tribute to M.C. Escher, born in Leeuwarden, by including the polyhedron known as Escher's Solid (which appears in his work titled 'Waterfall').
Founder of A Guide to Leeuwarden. Organising walking tours in Leeuwarden since 2013. Many Street Art Tours. Also makes the most up to date Street Art Maps of Leeuwarden.