The heart of the new museum design is the connection between the past and the present. The entrance to Amos Rex is through Lasipalatsi "Glass Palace", a distinguished 1930s Functionalist pavilion that was carefully renovated completely. However, the new museum space is designed below Lasipalatsi Square.
On the ground level the only visible façade is the roofscape of the underground exhibition halls and their skylight windows. The structure of the large domed skylights has enabled designing a column-free 2,200 m2 black box-kind of exhibition hall. The hall's scale is awe-inspiring with the ceiling domes, and it is designed to be modifiable and flexible for the future forms of art. The ceilings are covered with thousands of acoustic discs and floors are black hardwood block floors. The skylight domes provide subtle quality of light in the underground spaces.

Inside, sloping stairs lead down from Lasipalatsi to the airy and light lobby space that is designed to decompress senses before and after the art exhibitions. The lightning fixture covers the whole lobby ceiling and provides an ethereal combination with natural light from the sky light above. The furniture are oversized elements rather than furniture. All the functions are in matt black and visually strictly separate from the lobby space. The circular shape of the domes is used as a motif throughout interior design.
The exhibition halls are modified according to the exhibition and provide always a unique experience.