[womitt]

Could be some kind of map

[tdaltonc]

Discovered more than a century ago, many cave paintings are being reinterpreted game calendars. Recording which animals can be found where and when.

https://www.cambridge.org/core/journals/cambridge-archaeolog...

[lovemenot]

If so, it must be a symbolic map like the London Underground. Since geography doesn't have so many straight lines.