Sports FishingRather more than most other perennials, hostas tend to be very unstable (like their owners ?).
They often produce shoots with a completely different look..
Imagine a green hosta with one shoot that has a white center: that's a sport.
Some hosta people have made this a hobby within the hobby, sports fishing. They try to find shoots with a different look and grow them into new plants.
It's possible you'll find a sport on a hosta you grow in your garden, but the odds are much better if you can go through a large batch of tissue cultured plants. Since the introduction of tissue culture, the number of cultivars that came from sporting has risen enormously.
Unfortunately a lot sports are released on the market without examining if they're any good as a garden plant.