ERX is an interactive installation looking like an AI-powered vending machine. Rather than allowing users to make their own choice, the machine initiates a dialogue. It observes each visitor and asks them a series of questions before autonomously deciding which drink they “should” receive. By turning a simple decision into an impenetrable algorithmic process, ERX examines the dynamics of trust, belief and control that shape our relationship with artificial intelligence systems, which by their very nature remain largely opaque.