From a study based on the geometric figure of the super circle (or squircle), which combines the properties of a square with those of a circle, comes the design of the knob that distinguishes the collection called Super designed by Calvi Brambilla. At first glance, a simple shape to which the eye is almost unconsciously accustomed to in the everyday life as it has inspired various objects in the past. The initial challenge was to find the correct ‘squircle’ that would achieve the best ergonomics and thus comfort in the grip of the handle, offering a more generous hand surface than the circle without the hardness of the 90° angles of a square, and that could then be effectively extended to the other elements that characterise a complete bathroom series.