Architecture

Arches - 

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Tree Structures Here

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Spiral Railings - 

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Domes

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Roller Coasters

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Lumber

Ideas

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Post and Beam houses where load bearing beams are curved.

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Tree Houses that can be very large.

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look-out towers or view cabins.  Backyard tree houses for kids.

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Tree structures to hold up large roofs e.g. malls, gyms, auditoriums.

Houses, decks, fences, pergolas.  Depends on how low the cost of materials can get.

Lumber

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Sky scrapers.  Some modern sky scrapers are being given a twisted architecture.  Even steel can be extruded.