The unique appearance of the building is given by the rainbow-colored roof envelope, complemented by a monumental black column structure that covers the main entrance and a 29-meter-high inclined needle and ball in front of it. For better insulation, many of the walls are inclined, so the rooms, especially on the semicircular upper floors, are designed obliquely and rounded. The biggest challenge that was set for FEAL was to test and secure a sound insulation certificate for the Termo 85 H glass wall, and the sound insulation requirement was 50 dB.