If you are ever in Chicago, do not miss visiting the Cloud Gate Sculpture in the Millennium Park. Affectionately called "The Bean" by Chicagoans, the sculpture was designed by Anish Kapoor. He is said to be inspired by liquid mercury. Its unique design summarizes the whole Chicago city in its concave dome, which is one of those mathematical challenges that is as beautiful as Fibonacci's sequence. Here is the picture of the day:
