It’s rare in modern times, but sometimes you may encounter a sign board written horizontally right-to-left, as in this sign above the front entrance to the Nippon Budōkan:
https://commons.m.wikimedia.org/wiki/File:Nippon_Budokan_-_2...
https://commons.m.wikimedia.org/wiki/File:Nippon_Budokan_-_2...
That sign in particular says "Martial Arts Hall" ("budokan" / 武道館) from right to left.
Imagine an alternate universe where English could also be read left-to-right or right-to-left. If you were to see a sign saying "Hall Arts Martial", you'd immediately know the right way to read it.