Anno was mentioned as a similar author in the Testa book, so I went and had a look. Anno died in 2020 at the age of 94, and yes, he was conscripted into the Japanese Imperial Army late in WW2, but wasn't sent overseas. Later, in the 60s he traveled around Europe, and those trips became the basis for his fine arts and children's book careers. His art is lush and brimming with detail. The books contain no words, inviting storytelling & questions.