Bob, nice photo. All the masts add a lot to it, at least for me. I think it would be much less interesting without them. And Winnie, that is a surreal looking skyscape - beautiful.
More ecologically friendly than Lite-Brite, no doubt. There are similar foils in Transogram Mosaic games from the 1930s. The foil is usually applied over clay, isn't it?
A rice-sized piece of misplaced glass is not uncommon. I have seen the same on at least one completely different marble. I wonder how it happened - a drip or something? Tater Bugs with drizzle are around, although I don't recall ever seeing multiple bits of glass on a Tater Bug. Does that seem odd?