@cstross I hope Apple has looked into such matters, but the rule of thumb is the more complex and multimaterial something is, the less likely it is it'll be actually compostable. I worry about all the glue. Concrete-grade cardboard is also off the beaten track. Every time something goes into the recycle bin that's not easily or fully recyclable, it makes recycling less economically viable, and it's already financially marginal at best.