I like to think that Luanti caused this.

Do you believe in evolution by natural selection? Of course I do! Do you believe in evolution by unnatural selection? No! Traits that relate to violence vary strictly as a result of upbringing!

EDIT: I suppose your comment is written in a way that it’s not clear whether you’re saying certain frequencies absolutely require meshes of a certain size to be blocked or if you’re just adding that extra detail about the design of Faraday cages for the hell of it. But…

Original comment: It doesn’t have to have holes to block radiation. A continuous sheet blocks all frequencies. A mesh is just nice so we can see through the cage or allow air to pass etc.

From the page you linked: “A Faraday shield may be formed by a continuous covering of conductive material.” “… if the conductor is thick enough and any holes are significantly smaller than the wavelength of the radiation.”