Hasta La Ideas

This chair by Dutch designer Floris Wubben was made by binding and splinting the branches of a willow tree, forcing them to grow into four legs. 

A seat and backrest were then cut into the trunk and the whole thing inverted.

The chair was designed in collaboration with artist Bauke Fokkema.

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Here’s a tiny bit of text from Wubben:

Upside down

This chair is made of a (inverted) willow tree. The legs have been obtained by twisting and splinting its branches and letting it dry into the final shape. 
The seat and back were naturally kept in line with the bole’s silhouette. This project had been put in practice jointly with the artist Bauke Fokkema.

See also:

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Briccole Venezia by Matteo Thun for Riva 1920	Christmas Tree Furniture by Fabien Cappello	Harvest by Asif Khan