One thousand generations later I take a photograph of the Pyrenees from the window of a contrivance of artificial heavier than air flight, using a handheld telecommunication device. I use it to listen to a digital recording of music at the same time. The megafauna the painter depicted have long since been hunted to extinction. I think about the painter, and use the device to write these words, which I publish on a blog once we reach our destination.
One thousand generations after that a disembodied intelligence instantiates itself in a disposable avatar to visit a dead planet. The avatar goes into the cave and recognises something of itself in the paintings.
There was no reason to visit the cave. The avatar can immediately access scan data of the cave representing it in higher resolution than its sensory apparatus is capable of. All related scholarship is instantly available.
But the avatar knows a journey is now complete in a way the disembodied intelligence it instantiates can never experience. It feels an unfamiliar sadness and lonliness knowing it can never upload what it has found out, that the situation it finds itself in will only be viewed by others as if from a great height, not at ground level.
In a final futile effort to express this emotion before it deactivates itself (as it has now resolved to do) it retrieves a memory and makes an image of it that adheres to the wall of the cave next to the painting.
Thereafter the cave is undisturbed by any presence other than perhaps the descendents of a few invertebrates who survived the inevitable calamity that rendered the planet otherwise lifeless.

