IT SEEMS ALMOST inevitable that the most disruptive art experiment in Brussels wound up on Rue du Marteau — or Hammer Street, as it might be called in English. At the beginning of 2022, the French visual artist Salomé Sperling, 25, then in her fourth year at Design Academy Eindhoven in the Netherlands, discovered a listing for a 5,000-square-foot, six-bedroom townhouse about 90 minutes from campus by car that came with a 600-square-foot atelier. Sperling and four fellow schoolmates — Jaime le Bleu, 27, Ale Mangindaan, 24, Line Murken, 28, and Sijmen Vellekoop, 26 — decided to create a studio of their own in the house, located in the city’s densely populated Saint-Josse-ten-Noode neighborhood. The fact that the building was derelict and covered in at least a decade of grime, with patchy electricity and no heat, only made them like it more.