A former monk, Ekuan crafted a tabletop bottle for Kikkoman Corp in 1961, winning international popularity both for the handy, flask-shaped dispenser and of course for the salty brown condiment flavouring many Asian cuisines.
He has said he wanted to design a small bottle because of his childhood memory of his mother pouring soy sauce from a big half-gallon bottle to a tabletop dispenser.
Other of his renowned works include the Yamaha VMAS motorcycle, the Komachi bullet train connecting Tokyo and northern Japan, the Narita Express airport liner, as well as audio equipment and company logos.
He heard the voices of street cars, bicycles and other objects mangled and abandoned, saying they had wished to have been utilised more, he is quoted as saying in a company pamphlet for his Hiroshima exhibit last year.
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His design principle was a "democratisation" of goods and beauty, to make them accessible for everyone.
Ekuan became a monk at a Hiroshima temple to succeed his father, who died due to radiation from the atomic bombing. But he eventually pursued his career in design.
His office, GK Industrial Design Group, said today that Ekuan died of a heart problem at a Tokyo hospital early Saturday.
Last year, Ekuan received a prestigious Italian industrial design prize, the Golden Compass Award, after winning several other international awards.