Here’s a first: a fish tank that actually lets you pet/feed the fish directly. Unfortunately, it’s custom built and not for sale.Hit the break for more pictures.

The little cups on the sides of the tank in the picture are connected to the tank and open to the air, which allows the fish to swim into the cups to be hand fed (and petted or nuzzled if that’s your thing). The tank is sealed at the top, creating a vacuum which prevents the water from pouring out.