A quick search on the net seems to show that these lines are real.
https://en.wikipedia.org/wiki/Blaschko’s_lines
https://link.springer.com/referenceworkentry/10.1007/978-3-319-26594-0_152-1
No good articles on whether cats can see them tho.
Thanks for sharing this here. Got to know about a new thing.
Like tags n artist labels for mp3 files?
How is it done for other things?