You can think of the glowing line as your correction of an erasure. It’s as though your visual system decides that the actual message that was sent was a straight line, but that part of the line got erased in transmission. It corrects the error by filling in the gap with a glowing line. This is similar to error correction in a simple “Hamming” code that can send only two messages: 000 or 111.21 If the receiver gets, say, 101, then it knows that there was an error, that the middle 1 got erased, so it fixes the erasure and arrives at the message 111. This Hamming code uses three bits to send
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