“Paper-Scissors-Stone,” the most recent show by Belgian artist Leon Vranken, got off to a powerful start with Flowing Line, 2014, a jet of water noisily shooting out of a circular pit cut into the floor, enclosed by a white railing. As with Study of a Vertical Line, 2013—the thirty-six-foot-high fountain and ascendable scaffolding structure that the artist erected at the Middelheim Musuem, an open-air sculpture park, in Antwerp, Belgium, last year—visitors could experience the top of the water jet, here by moving up one floor within the building. The fountain spouted right through a