The #1 Paid App: Koi Pond
The developers describe their creation:
Imagine gazing into a pond of crystal clear water. Picture bright, playful koi swimming through its shallow depth. So close... Can you touch them?
You run your fingers across the cool surface of the pond. Water ripples away from your touch. The koi, disturbed, dart away. Only to quickly forget and swim close to you once more..."
Here's a video of the newest version of Koi Pond which appeared in the App Store this week.