The MuscleBody is a full-scale prototype of an interior space. Its continuous skin incorporates all its architectural properties and makes no categorical distinctions such as floor, wall, ceiling, door. The interaction between the MuscleBody and its players (the people that have entered the interior space) causes the MuscleBody to change its shape, its degrees of transparency and the sound that it generates.

The structure of the MuscleBody is based on a spiralling tube that is bended in 3D. 26 industrial Festo muscles control the movement of the MuscleBody. The skin is made of Lycra, and its translucency depends on the degree of stretching. Speakers integrated into the skin generate sound samples that are combined and transformed according to the behaviour of the players.

The game starts when from the moment the visitor enters the MuscleBody. Information is abstracted from the behaviour of the players in real-time by pressure and proximity censors that are imbedded in the skin. The game-software VirTools organizes the relations between the input received by the sensors and the output consisting of the behaviour of the muscles and the generated sound.