How could the windows at the Tugendhat House make the main living floor feel open to the outdoors?

The windows at the Tugendhat House were designed by Ludwig Mies van der Rohe to create a seamless transition between the interior and exterior environments.

On the main living floor, the architect incorporated a mechanism that allows the large glass windows to be entirely lowered into the basement level. By retracting the windows in this manner, the physical barriers between the living space and the outdoors are removed, effectively restoring the sense of openness found in his earlier Modernist pavilion designs.1