"At the moment, we are leaning toward an indoor installation," he added, "primarily to guard against vandalism and other problems."

At her instigation, too, the couple branched out into indoor installations and performance.

Of the other pieces in this year's show, Jim Hirschfield's "Synesthetic Dream" is technically an indoor installation assembled in a turretlike gatehouse on the grounds.

For indoor installation, a ventilation kit was provided, but it was not used, investigators said.

These transformers simplify installation since they are dry, without cooling oil, and so require no fire-proof vault for indoor installations.

Sound sculptures take the form of indoor sound installations, outdoor installations such as aeolian harps, automatons, or be more or less near conventional musical instruments.

The company has models designed for both indoor and outdoor installation, as well as for residential and commercial uses.

It will be the first indoor installation.

"George Rickey: The Art of Movement," as the show is called, includes models for other larger sculptures, an indoor installation and outdoor works displayed in a tree-lined grove.

Another advantage of the indoor installations is that they can be open rain or shine, day and night, and all year round.