Some clever artists have come up with the idea of making pictures with coloured sand in a bottle, usually a narrow necked bottle to boot. The pictures can be exquisite and tiny when in collectable bottles that easily fit into a suitcase or full of delightful detail when in a larger glass vessel like a vase.
It's impressive to see the finished result, sand all packed down so it won't mix again and sealed before watching eyes. However do they do that? It's always the first thing one asks.
We've discovered there's a trick to it, to make it commercially viable, but we're not telling.
