صدای چرخیدن

Metal cart rolling on floor (3), fragmented.

Shopping cart - pushing outdoors.

Rwanda, Downtown Kigali - busy street with whirring motorbikes, traffic, and people (1).

Rwanda, Downtown Kigali - busy street with whirring motorbikes, traffic, and people (1).

Rwanda, Downtown Kigali - busy street with whirring motorbikes, traffic, and people (1).

Servo motor -- metallic spinning, varying speeds, in a cycle.

Servo motor -- low revving, on and off.

Servo motor -- mechanical movements.

Servo motor -- running low with intermittent variations.

Servo motor -- metallic spinning, varying speed (1).

Servo motor -- running low with some variations.

Servo motor -- low revving, shutting off, and then idling.

Servo motor -- low spinning, then fast acceleration (2).

Servo motor -- medium-paced revving.

Humming transformer station from inside a wind turbine (9).