square-shaped watermelon

I found a square-shaped watermelon at the supermarket near my house today. I have seen it for the first time. I don't know why it is square-shaped but it is convenient for you to store in the refrigerator. The price was about $80. It is too high! First of all, I like watermelon but it is too much to eat up all by myself. I wonder if it is delicious.