Annular is a unique and integrated wood culture web hub spanning the wood wide world

Annular – full spectrum Annular: Uncover Annular’s expansive branches, canopy and root systems: art, books, trees, forests, design, ecology, design & make, digital timber, craft, architecture, plus.

You’ll find in-depth, up to the moment themed editions on Europe’s timber transformation in architecture and the built environment in Annular Unstructured.

Annular Further, provides a comprehensive forests, wood and timber culture resource, and a full archive of Fourth Door timber building and wood culture features is available in Annular Archive.

Annular Nu features new wood and timber pieces, and other news from Annular.

Annular Unstructured

Free Form Swallows Function – Swiss made engineering turns timber towards the future.


Access all sections: Art, Books, Forests, Architecture, Digital Timber, plus plus plus.

nu – Annular News

Latest wood and timber related features, pieces and updates.

Annular Archive

Twenty years of in-depth timber features from Oliver Lowenstein and Fourth Door.

Annular Further

A new set of Annular Nu features are now live.

About Annular

A brief history of Fourth Door’s Annular project.

nu – Annular News

Post Industrial and Pre-Modern in Molfsee – Molfsee open-air museum’s 100 Year Haus.

Domes Far from Home –Kazakhstan’s Kolsai Biosphere Reserve includes a surprise, a cluster of woody Geodesic Domes.

Limber Lines – Reviewed by Bryony Bodimeade – reviewing Treeline2021 by Ruth Maclennan, installation video at Whitechapel Art Gallery.

Rawlam from the North –CITA’s Tom Svilans on the joint Copenhagen and Aarhus robotics research.

Forest 4.0 Balancer

The Forest 4.0 Balancer project is set to explore relationships between forests, carbon footprints and construction.

Check in on this new research project.

on nu now

New wood and timber features are on Annular nu.

Features include Molfsee open-air museum’s 100 Year Haus, two perspectives on RSH-P’s Macallan Distillery Centre in the Highlands, a review of Ruth Maclennon’s Treeline video installation at London’s Whitechapel Gallery, and Forest Therapy from Umeå University. 

Pioneering the Potential and Fourth Door events

Access the Fourth Door Events page (coming soon), including Pioneering the Potential past, present (and future.)

Information on Fourth Door events, including 2023’s Pioneering the Potential Evolving the Bio base.

New Unstructured 11 edition

The new Unstructured 11 timber features include RawLam research from Copenhagen’s CITA robotics lab, and Waugh Thistleton’s Anthony Thistleton on two recent CLT books. Plus Super-Horizontal and Rail du Ferme photo essay, and much else besides.

Annular – as trees increase in size they add Annular Rings (or growth rings) year on year. Much can be learnt about trees, woods and wood from tree rings that is otherwise inaccessible.

Satellite forest map – European Forest Institute

Annular founding supporter