Like shadows burned on the sides of buildings in Hiroshima
I think they are talking about this but I don’t exactly see how this is related to the topic
There’s a short story by Ray Bradbury about an automated house that survives a nuclear blast. The shadows of the children throwing a ball are on the house outside, and inside the robots continue to service a family that’s no longer there. That’s what it reminds me of.
https://en.wikipedia.org/wiki/There_Will_Come_Soft_Rains_(short_story)