
Time to pick up this project I started several months ago…. The aquarium has been finished for a while, so now I'm building a light-proof box to contain it. The wood is some 1x4's, leftover from the fence my wife and I built last summer, with some scrap 2x4's to make the base.

Knocking at it with a demolition blade on a sawz-all and the claw end of a hammer, then going in with a rasp to smooth it out so it looks like driftwood.

The shelf that will hold the aquarium is a spare piece of MDF, and I patch the spots where I don't want light to leak out with celluclay, which is surprisingly strong for a paper mache product. And it adheres to the wood really well, so I end up using it as spackle to cover all the screw holes, and it sands away nicely.

Darkened with oil-based stain and left to dry 24 hours, then brighter colors of acrylic paint are scumbled onto the surface, and water stains are dripped down from the top. At this point I drill in the AC power switch for the whole case.

the algae in-between the planks was done in UV-reactive paint, so if a blacklight is in the room, the crevices glow, just like the car in "Repo Man".

The aquarium inside the cabinet. Interior walls are heavy watercolor paper that I airbrushed with UV paints. On top are the blacklight, air pump and pressure regulators for the five motion features inside the aquarium.

With those things moved out of the way, better showing the layout. The scuba diver is on an electric motor, outside the aquarium. This is a battery-powered turntable that I converted to an AC transformer. I also stepped up the voltage to make him swim a little faster.
The whole landscape is on a sheet of plexi, which I'm tacking down to the glass floor with silicon (I wanted it to be removable, in case of design changes, air leaks in the pneumatics, or if the aquarium needs to be replaced). The landscape is styrofoam that I painted in UV acrylics, then did a cover or marine-grade epoxy resin.
The first landscaping material I used was paper mache. You're probably smarter than I, so I don't have to tell you what happened when I submerged that in water, even after I'd used 59-cent black paint from Michael's that said 'cleans up with water' on the label, and brushed it with water-based acrylic medium as a sealant (slaps own head).
The styrofoam works, but it wants to float, so when it's underwater, it repeatedly breaks the baseplate away from the silicon glue, bringing the whole display up to the surface. If I could do it over again, I'd use rocks, which would have the same look anyway, and don't have to be sculpted. Plus they stay underwater, which is what I'm looking for here. Anyway...

...there you go; a big blocky monolith. It's fantastic if you're looking through the viewer, but the exterior doesn't work as a sculpture, or even as a decorative element in a room. Ideally, I'd mount the viewmaster viewer onto a false wall, hiding the aquarium and electronics behind it, and ditch the wooden box. But I had all the material in my garage already, and it only took a couple of days to build, and I needed to finish it and move onto some more challenging sculptures.