If you're like me, you save your spent batteries in some container. When the container threatens to overflow, you take it to a recycling center or a store that has a recycling drop off. Right? Now we have a reason to actually save those batteries for later use, according to artist Michel de Broin. His 'Dead Star' is made of hundreds of them. I'm thinking a chunk of salvaged styrofoam sprayed black, some good 2-part epoxy and patience would do the job.