The text analyses designing interactions in immersive spaces, which go beyond screen interfaces. The authors – founders of the Melt Museum and the Melt Immersive studio in Warsaw – observe evolution, which leads from classical artistic installations (Olafur Eliasson, Random International), through large-format entertainment objects (Sphere in Las Vegas) and the museum-laboratory model (teamLab), all the way to their own practice: original multisensory installations, in which the visitor’s body becomes a natural controller. The article presents a particular working methodology, from hacking the Kinect sensors, through the use of Unreal Engine 5 and TouchDesigner, to experiments with the brain–computer interface, and discusses cultural differences in the approach to immersion. Its original contribution is the proposal of reformulating the notion of interface in immersive design. In the analysed experiments, the interface is no longer a screen, a controller, nor a visible device, but a dynamic relationship between the visitor’s body, space, and algorithm. Movement, breath, presence and distance become data, which are interpreted and processed into experience by the system.
Keywords: immersive design, human–machine interaction, new media art, natural interface, multisensory space