Here's a chalk portal created by an unknown artist in an unknown city of an unknown state. Despite all the unknowns, the sidewalk drawing is absolutely fantastic. [James Stowe via NerdApproved]
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Update: Thanks to some help from @izenmania and @Tom, we found the artist behind this chalk drawing. It's James Stowe and he entered this creation in the Frost Park Chalk Off held in Tacoma, Washington.
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