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Everyone -

Let me focus my original question a bit - 

We've got a $12,000 donation and a nice patch of flat lawn (triangular, about 40 feet long and 15 feet wide at the widest end).  

We are doing a nice native-planting/river landscaping thing on another piece of riverfront property, so no need to rivers stuff on this patch.  I was thinking more along the lines of echo tubes, etc. - solid, few moving parts, last 5-10 years.  Too cloudy for fun Clore Garden solar stuff, and water/plumbing is too expensive for this area. (Could I make this more impossible?!)

My own list, and a summary of this discussion (minus the water ones) runs to:

Giant 'magnifying glasses' with different filters and lenses
A field of 6-foot turbines
Drums
Pan Pipes
Echo Tubes
Sound Delay Tubes
Heat Tunnels - one black, one white
Element Stones (Flush-to-ground 'headstones', each with an element on it)
Torsion Wave
Lever Lifter
Human Sun-Dial
Hedge Maze
Rock Maze
Optical Illusion Sculptures
Sand
Rock Maze

- Dennis Bateman

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