Just as electric vehicles can have skeuomorphic “engine” sounds for safety [1] or aesthetics [2], I’d love to see a service that emits “fan” noise to track CPU usage.
I have my motherboard set to run the CPU radiator fans a low-moderate speed at ~50 degrees C and below, but ramp up rapidly approaching 55+, with no hysteresis or gradual ease-in. I can absolutely gauge CPU usage on a second-by-second basis by fan noise. Any transient spikes cause an easily perceptible (but not overwhelming) wooshing.
I used to have something like that with an old machine with poor, spluttering cooling. You could really tell every time something processor intensive was running.
It was actually quite useful at times. For example, if some webpage was constantly running some heavy javascript, the fans would soon alert me that something was up.
(I used to discern between program stages on 286/386 because sound of power supply was different for different loops)