How'd This Happen?

I can see... I can see...
Via hole: An opening connecting the wiring on the front and back of a circuit board.
Artist's commentary
ใใใฐใๅฐๅใใ 3747
่ชๅใฎๆฅ้ ใฎ่กใใๅฐๅใใใซๆๅฝฑใใฆๆใใฆใฟใใใจใใๆฅ่จๆผซ็ปใงใใ
ใใใข็ฉดใใจใใใใใใขใใงใใญใ
ไฟ่ญทใใฃใซใ ใ่ฒผใใใฆใ้ขใงใใชใใงใใใชใใจใซใปใปใปใจใใใฎใ็็ดใชๆๆณใงใใใ
้ใงใๅนใใใใงใใใญ๏ผ
Hang in There, Kogasa-san 3747
They're called "via holes" or "vias".
There was even protective film applied to the surface, so how could this happen? That was my honest impression. Maybe it rusted or something?
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