Abstract: A compact (such as a 4?×7?×7?) decorative, self-contained, internet-connected low maintenance terrarium that is completely passive and contains no moving parts. The terrarium device is such that it can sustain itself, with no human maintenance necessary, for several weeks at a time. The terrarium has a computer processor, wireless connectivity, one or more LED lights, and a durable optical water sensor and reservoir design. The terrarium is configured with embedded and connected logic for full internet of things (IoT) functionality.

Abstract: A system of modular artificial rocks provides natural looking running water. A crevice rock has a floor and a barrier. A convex portion under the floor is over a reservoir. Water pumped through a hole in the crevice rock floor rises to a hole in the barrier. The water flows through the barrier hole and runs down the convex portion, from which it falls into the reservoir. The floor may have a depression that matches the size and shape of the convex portion. The system further comprises a second rock that interfits with the crevice rock barrier. Water is pumped simultaneously to the crevice rock floor hole and to a hole in a top surface of the second rock. The water from the second rock runs down and falls onto the crevice rock floor. A third rock may be interfit on the second rock and be similarly supplied with water.