We've all seen our fair share of chalk art, but German artist, Nikolaj Arnt pushes the boundaries with a combination of pigment and chalk in city streets, alleyways, and even his own living room. His works are interesting, because most often, they invite viewers to physically interact with them. Through Arnt's pieces, suddenly things like touching a dolphin or holding a lion by a leash don't seem so unlikely after all. 

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[via Enpundit]