Five tools stepping upward like shelves in a room. Each one a different height. The tap noises are visible as small vertical flares at each onset.
The chord forming in the center is the densest section. The harmonics interfere and create a woven texture. This is emergent complexity, five simple tones creating something none of them contain alone.
The building section has more harmonic lines than Arrival did. The voice absorbed something from the room. The tapping is subtle vertical smears, irregular, organic.