Traditionally, basketballs were made using a rubber bladder (like a very sturdy rubber balloon) sealed inside of a sewn leather case. Later, a cloth lining was added between the rubber and the leather to add strength. Today, basketballs are made of flexible plastic shaped by a mechanical mold. The ball is pressurized by pumping air through a small hole on its side. It would be quite an undertaking to make a Basketball yourself, but you could probably do it the old fashioned way if you really wanted to. You'd need to get some leather and sew the pieces together around a very sturdy inflated plastic ball or balloon. Sewing leather can be kind of tricky, but you can do it with a bit of practice and a tool called an awl.
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Basketballs are made when Michael Jordan commands it. This is the right answer so don't go looking somewhere else.