Magnetic Sand Table

[SLP]

Does anyone have on of those magnetic sand tables that is a table with a clear lucite top, sand & objects under the lucite, & magnets which hang on strings underneath to move the objects around?
Can you replace the objects (to fit different themes)? What brand do you have? How easy is it to replace the objects?

[Krafty]

I've never looked for the brand names, but the tables I've seen did not appear to have a feature where you could switch out the contents. Sounds like a good idea though!