The Infinity of Knowledge. The Prague Municipal Library at Marianske Square, Zilina, Slovakia is definitely worth visiting because of an amazing sculpture made of numerous books by Matej Kren, a young Czechoslovak artist. This wonderful sculpture is placed in the Prague Municipal Library, consisting of books and mirrors, creating an unusual effect of infinity. It kind of reminds us of Alice in Wonderland, (Down the Rabbit Hole!), the amazing, infinite path towards knowledge, but it gives us a feel of obscurity — totally, a must-see piece of art in the world of optical illusions!