David Cameron

All good ideas so far. We use solid 5/8" panels of styrofoam board that has reflective aluminum skin on both sides. I taped edges to reduce damage & wear. Thes have been in use 8 winters & still fine. Since main heat in the room is woodstove there is a lot of radiant heat which the aluminum skin bounces back into room. We also hang a decorative light wool blanket over the foam to add some thermal insulation. Panels are moved to empty-ish room in daytime.
I've been noticing a clear rigid foam packing material (looks/feels like course neoprene) that looks interesting as it would be thicker than what we are using but would let light in so could possible be left in place day & night.

On new builds, exterior foam-insulated shutters that can be closed from the inside as well as outside, would be nice.

I bought agricultural alfalfa from farmers co-op store for many years. No guarantees about whether they are organic, but they sure did grow well & were very inexpensive compared to those from whole-foods stores.

I have a treadle grinder/polisher made in 1895. I used this as a silversmith and as a knife-maker for decades. It was perfect for the decade we were off-grid and gives better control than electric grinder/polishers. The leather belts need replacing now but otherwise I expect this machine could go on working for centuries more.

Does anyone know of any lichen that will grow in a high-lime environment? Building with hemp-crete is way cool, but would be even cooler if some surfaces could be coloured using lichen. Nova Scotia has a generally humid environment so lichen grows well, especially along the coast where one sees the brightest orange and yellow lichens on rocks and old concrete. Hmmm, old concrete-that should contain significant lime, perhaps the varieties that grow on concrete would grow on a lime surface??