Fun. I have always imagined using trees to build a fence one one side of my house with an annoying neighbor. Zoning rules say that fences can only be 6' (2m) tall, but trees? They just grow and grow :-).

Looking at the picture on the web site of a chair (https://fullgrown.co.uk/wp-content/uploads/2018/04/National-...) I wonder how durable they will be. Interesting tradeoff between how "complete" the chair is and how much time it takes to grow. There is also pretty clear evidence that its been planed at least somewhat to make for smoother surfaces. Where do you draw the line here? You could put a 1m diameter log into a 5 axis milling machine and have it carve away everything that was not 'chair'. Would that count?