I did this in a field in Hirafu Village, Japan[1] near the end of April about 8 years ago . We didn't know about the spiral part, and so we just did it in layer

I did this in a field in Hirafu Village, Japan[1] near the end of April about 8 years ago . We didn't know about the spiral part, and so we just did it in layers. The spiral approach does seem like it would add a whole lot more stability that was hard to get without the first two bricks in each layer being a bit precarious. Our tools were mainly an avalanche shovel and a few snowboards. When it was done, we managed to fit about 11-12 people inside, and had a small fire on a table fashioned in the middle of the igloo (as well as way too much Saki). If you ever get a chance to do this, it's tough work, but well worth it. [1]: Somewhere around 42.86131738850902, 140.70182135196615 on a map.