Square watermelons are a unique Japanese invention that are grown inside square boxes. The boxes restrict the watermelons' growth, causing them to take on a square shape. This makes them more convenient for stacking, shipping, and refrigerator storage. Square watermelons were first developed in Japan in the 1970s by a graphic designer named Tomoyuki Ono. Ono was looking for a way to make watermelons easier to transport and store, and he came up with the idea of growing them in square boxes. Ono's idea was a success, and square watermelons quickly became popular in Japan. They are now sold in specialty stores and supermarkets all over the country. Square watermelons are also exported to other countries, such as the United States and Europe. Square watermelons are not only convenient, but they are also visually appealing. Their square shape makes them a unique and eye-catching addition to any fruit bowl or table setting.