The Könstig art gallery in Control Resonant contains the Echo exhibition, a secret puzzle in the Evacuation Zone. Solving it opens a hidden basement room, which rewards players with a health point and additional lore collectibles.

A note lists four artworks sold that month: “Journey”, “Windows”, “Thunder” and “Tides”. Players must use four switches around the gallery to light the matching paintings; once all four are illuminated, a wall opens at the back, revealing the basement hideout and its rewards.