That looks like a fun build and I already have a lava lamp! Anyone got an RPG-7 they can spare?

The wand of Magic Missle!

"It's a lava lamp, Mom! I swear!"

Put the heavy part at the top and make sure the base is fairly narrow. It won't fall down. It won't fall down!

Plus if you ever get bored and there's a police helicopter hanging around you can always just take it outside and just hold it.