CERO, the “invisible window”, combines functionality with superior esthetics. It features expansive glass panels with frames and sections that are so slender it's hard to imagine how a closed window can feel so open. The thermally insulated 34 mm aluminum sections are barely the width of two fingers while the concealed frame fits seamlessly into the floor, wall and ceiling. A single sliding element can measure up to 15 m², with a maximum weight of up to a 1,000 kg, effortlessly gliding to the side with the push of one hand. The inside and the outside are able to blend into one with all glass corner and barrier free threshold solutions.