[a fool in paradise]

Just a hacked version of a decades old technique of using a laser to pick up vibrations off a window.

[eclectic]

Not at all. This is a passive method.

[minnesota_bound]

I read the article but the english seems to be a second language to the writer. BTW I had a booklet of electronics kits, must be back in the 1970’s that explained about the spying using window vibrations.