Walk along a sidewalk and you may soon encounter an unexpected bottomless pit, a wild lion on the loose or a pool of whales. But why and how is this possible? The Russian artist and art teacher Nikolaj Arndt will have you asking this question as he showcases his remarkable 3D art on streets across Europe. When Nikolaj was in Germany in 2006, he drew inspiration from street art festivals and was determined to participate - finally achieving his goal 3 years later. He states that the main purpose of his art is "to give positive emotions to the audience", and for him it's most rewarding when he sees people smiling while looking at his art work. How can you not smile in admiration when you come across such brilliance?