I can lose hours going into a branch of Muji. All those satisfyingly minimal solutions for storage you never knew you needed... Sometimes I just like to imagine I'm really organised and, if I was, what I'd put in all those little acrylic containers. But this season it's Muji's wood that's got me going. And since last week was all about beautiful Japanese things that are hard to buy, it only seems right to share. The new shelving range (on sale n the flagship London branch, Tottenham Court…