From bin 2 to bin 3, and then the contents of bin 1 to bin 2. Heaps and piles in—garden residue, leaves, kitchen scraps—and surprisingly little out.

It takes three years for the voluminous material thrown into bin 1 to end up as a wee pile of black gold in bin three, and all I have to do is shovel, once a year, from one bin to another.