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I heard that these small holes are supposed to be Helmholtz Resonators. If tuned to the right frequency, they can help with noise reduction.

https://hackaday.com/2023/12/24/absorbing-traffic-noise-with...

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With holes like that, birds, bees and rats will nest in those bricks.

I bet birds make excellent noise-absorbers.

Rats also

Probably clean up discarded biological matter pretty well. Rats have decent cognitive capabilities. I wonder if trained cleaning rats would displace the naughty variety.

https://www.theguardian.com/environment/2022/feb/01/swedish-...

Wild rats aren't naughty. They're just animals trying to make their way in the world the same as the rest of us. But they do make a mess and carry diseases, again maybe the same as the rest of us lol.

Agreed, my use of “naughty” is to acknowledge that rats in a relatively natural state have some characteristics deleterious to close human habitation.

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