News Home & Design Brilliant Prefab Cabin's Movable Nested Shells Open Up to Nature This flexible flat pack structure has a number of possible layouts. By Kimberley Mok Kimberley Mok Twitter Writer McGill University Cornell University Kimberley Mok is a former architect who has been covering architecture and the arts for Treehugger since 2007. Learn about our editorial process Updated September 24, 2021 07:16PM EDT Fact checked by Haley Mast Fact checked by Haley Mast LinkedIn Harvard University Extension School Haley Mast is a freelance writer, fact-checker, and small organic farmer in the Columbia River Gorge. She enjoys gardening, reporting on environmental topics, and spending her time outside snowboarding or foraging. Topics of expertise and interest include agriculture, conservation, ecology, and climate science. Learn about our fact checking process Share Twitter Pinterest Email Jorrit ‘t Hoen & Tonu Tunnel News Environment Business & Policy Science Animals Home & Design Current Events Treehugger Voices News Archive We've seen many great examples of multipurpose, space-maximizing "transformer" furniture over the years, as well as some jaw-dropping transformer apartments too. Rarer still are tiny houses and cabins of the transforming type, though we've seen some here and there with walls that morph or roofs that retract. Dutch physicist-turned-designer Caspar Schols might likely take the cake, however, with this brilliant flat-pack cabin that has entire sections of a transparent interior shell that slide in and out, depending on the weather. Jorrit ‘t Hoen & Tonu Tunnel Dubbed Cabin ANNA, this latest version is based on the Garden House prototype that Schols originally built for his mother back in 2016. This new iteration is built according to some of the same design principles: an inner skeletal structure made of glass that can be separated from the outer wooden walls and the metal roof, thanks to a clever system of metal rails that are integrated into the deck, thus allowing the occupant to create various layouts. As Schols explains on Archello, the cabin is almost like a layered garment of sorts: "I was playing with the idea to create a new design based on the fundamentals of ‘Garden House’. I wanted to design a sellable, fully inhabitable house, a flat-pack that could be build and re-build anywhere in the world. [..] ANNA is a dynamic home in the shape of an open platform to live with, rather than against the elements, by playing with the configuration of the layers of the house. Just like the way you dress yourself to suit different weather conditions, occasions and moods." Jorrit ‘t Hoen & Tonu Tunnel This flexibility is made possible by a system of two pairs of rails that run parallel to each other. Jorrit ‘t Hoen & Tonu Tunnel Shown here is the ANNA Meet model, which has two long glass shells supported by a wooden truss frame, which is embedded within an exterior shell is made with larch wood. Jorrit ‘t Hoen & Tonu Tunnel Here is ANNA when both wood and glass shells are completely interposed and connected at the center, leaving both ends of the wooden deck open. Jorrit ‘t Hoen & Tonu Tunnel Here is ANNA when both of the glass shells are pushed out to the edges of the deck, creating two sunrooms on either side. Jorrit ‘t Hoen & Tonu Tunnel Conversely, when the glass shells are placed in the middle, and the wooden shells out to the sides, we have a large, centralized sunroom that is perfect for dinner parties or for meetings, all surrounded by nature. Jorrit ‘t Hoen & Tonu Tunnel Finally, we have yet another possible configuration when both layers are wheeled out to fully expose the center to the elements. Jorrit ‘t Hoen & Tonu Tunnel Here's another view of the glass shells, which have door-like panels constructed out of metal, and which split in half when pushed apart. Jorrit ‘t Hoen & Tonu Tunnel Seen here is the interior of ANNA Stay model, which is made with sustainably sourced larch wood and birch plywood. It features a simple layout: besides the space for a bedroom and a kitchen on the ground floor, there is also a mezzanine overhead that is large enough to fit a king-sized bed. Jorrit ‘t Hoen & Tonu Tunnel The living area is heated with a woodstove, though electrical heating can also be installed. Jorrit ‘t Hoen & Tonu Tunnel There is a bathroom and shower in the stationary part of the structure as well. Jorrit ‘t Hoen & Tonu Tunnel These newer versions of ANNA features a number of improvements over the original Garden House that Schols designed for his mother, also named Anna. He explains: "The long narrow shape [of the horizontal windows] and their positioning right under the overhang of the roof makes sure only indirect sunlight gets in, so the space doesn’t heat up in summer. The windows also give a panoramic view, but only when seated in a chair, or after waking up and experiencing the view from the bed. This way, when the wood shells are closed there is a warm, cosy, indoor atmosphere protected from the elements, for these moments in which the weather is more hostile. Or simply when your mood is such that you like to hide a bit from the world. This contrasts highly with the exposure, freedom and openness that is experienced when only the glass shell is closed or everything is open." Jorrit ‘t Hoen & Tonu Tunnel To lighten its impact on its immediate environment, the cabin rests on ground screws that allow it to be easily disassembled in three days and moved in the future. In addition to the ANNA Meet and ANNA Stay models, there is the ANNA Me, which can be further personalized to individual clients' needs. Costing around $98,600, not including transportation and assembly costs, the cabin's components can be easily transported and assembled with a small crane and five people in around five days. To find out more, visit Cabin ANNA.