From the source:
1010 first began creating his “hypnotic portals” in 2009 throughout the city of Hamburg. Using the sides of buildings and abandoned wall spaces 1010, turns an unassuming wall into a colorful gradated void that seems as thought you could step right in and out to the other side. The depths that the artist creates on a 2D plain is perplexing in a good way, as the murals trick our mind into believing his transported vision.
Stunning layers of colors closely overlap as they spread out like liquid that pools up into the darkness at the endless center. The artist carefully maps out work that works its way out of the darkness, finally reaching the lightest colors on the wavy borderline. The resulting polychromatic grottos disrupt the stagnant structures of the urban landscape, bringing a beauty and mystery to the systematic components of the city they inhabit.