Robyn Law, a night filming crew stalwart, showed me twin bowerbird bowers in a garden which she looks after, a short drive from my place. Twin bowers, which are separate structures that stand close together, are an even greater rarity than double bowers, whose two passages share a dividing wall. I filmed the remains of a double bower in April 2010. The builder appears to have blocked off the right-hand passage by moving its side wall next to the dividing wall. I have been unable to find an explanation for the twin bowers, which are the only ones I have ever seen. They contain more twigs than other bowers I have filmed, presumably because there was such a plentiful supply at the construction site.