Front of PCB with LEDs visible through cutouts.
https://hackaday.social/system/media_attachments/files/110/948/325/487/698/330/original/47d8e60a1f07d943.jpg
I've taken apart a lot of stuff over the years, but I think this Epson printer front panel might be the only time I've ever seen reverse mounted SMD LEDs used like this.
Usually this is the kind of thing you'd see in a hacker conference badge, which is making me wonder who got the idea from who...
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