Apparently AI works because you can add and subtract words. day - light + dark = night​
Discussion
Japan + saurkraut - Germany = sushi
Word vectors. Word2Vec - now I think more than 10 years old, but when you first start learning about large language models, and you encounter this, you're like "oh, that is cool"..... 
. https://en.wikipedia.org/wiki/Word_embedding
Partly