They're present in almost all of her work.

Eastern thought had quite a moment in the sun in the 60’s and 70’s. All I can say is lead poisoning does terrible things to the mind over time.

UKLG deliberately wrote Earthsea in the guise of a Western high fantasy, but its philosophical core is the Tao Te Ching. It was set in the archipelagos similar to SW Asia, with similar ethnicity.

The producers who made the movie casted the crew ignoring UKLG though I think contractually, they were supposed to listen to her. I wouldn’t be surprised if they swapped out the philosophical core.