For years consumers struggled to fit the large round fruit in their refrigerators. And then there was the problem of trying to cut the fruit when it kept rolling around.
But 20 years ago a forward-thinking farmer on Japan's south-western island of Shikoku solved the problem. The farmer, from Zentsuji in Kagawa prefecture, came up with the idea of making a cube-shaped watermelon which could easily be packed and stored.
Today the cuboid watermelons are hand-picked and shipped all over Japan.
Here is another space saving idea from Japan