Pyramids.

Copper and magnets plus the pyramidal shape are known for their regenerative qualities. Pyramids are available in sizes ranging from 10ft to 6 inches. They look great nested. Connected purely by magnetic attraction, they can be dismantled and reassembled making them easily portable.
A crystal can be hung in the center too.

Transformers.

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 Transformers can make a variety of shapes or be hung from the ceiling. Kits come with 36 magnetic copper rods (either 18 inches or 6 inches long) and 14 stainless steel balls.