Singular trace

A singular trace is a tiny, tiny mark or line left behind by something that moved or was created. Imagine you have a big box of sand and you use your finger to draw a line in it. That line is a singular trace. Or if you have a toy car and drive it across some paper, the little tire marks left behind are singular traces. They might be hard to see, but they are there and can give us clues about what happened before. It's like a secret message that only those who can find it can understand.