The shelf you never have to throw away.

Most furniture is designed for the room you have now. The sofa fits this wall. The bookcase fits that alcove. Then you move, or someone moves in, or a baby arrives, and the thing that fit perfectly becomes the thing you sell for forty dollars to a stranger with a van. In 1960, a 28-year-old Dieter Rams designed a shelving system for the rooms you haven't lived in yet.

The 606 is simple enough to describe in a sentence. Aluminium tracks, which Vitsœ calls E-Tracks, go on the wall. Shelves, cabinets and a desk hang from them on pins, with no tools. Lift a shelf, move it up a few inches, and the whole thing is rearranged in the time it takes to make coffee. Where a wall can't take them, the tracks fix to posts instead: posts that stand just in front of the wall, posts compressed between floor and ceiling, or free-standing posts on their own feet.

That's the clever part, but it isn't the remarkable part. The remarkable part is a promise Vitsœ has kept for more than sixty years: every part it has made since 1960 still fits. A system bought in the Sixties can take a shelf ordered this morning. The colours stay the same, so the new shelf doesn't look like a patch.

You don't finish buying it. You just stop needing more.

Which means the 606 isn't really a thing you buy once. It starts as three shelves over a desk in a first apartment. It becomes a wall of books when the books arrive. It gets split in two when a room turns into a nursery, and it goes with you when you move. Vitsœ keeps the records of your system and will help you plan it again for the next place. Some people inherit one from their parents and simply add to it.

None of this is cheap, and it would be silly to pretend otherwise. A full wall runs well into the thousands. Vitsœ's own answer is to divide the price by the decades you'll use it. That's true, and also exactly what anyone selling something expensive would say. The more convincing evidence is how the company behaves. Its planners work without commission and tell you to buy less to begin with.

It also isn't a showpiece. The tracks are aluminium, the shelves are powder-coated steel, and the whole thing is designed to go quiet and let the books, records and plates do the talking. Rams' own phrase for this was less, but better. It's easy to turn that into a slogan. The 606 is what it looks like when someone actually means it.

We like it for a reason that goes beyond shelving. The world doesn't need more things. It needs things that deserve to exist, and then deserve to stay. That's the standard we'd like everything in this Guide to meet, including the furniture we make ourselves. Few objects meet that standard as plainly as a shelf designed in 1960 to still be useful in a room nobody had imagined yet.

If you're curious, Vitsœ's planning is free and comes with no obligation to buy. In Los Angeles you can see the system by appointment at Mud Australia on Beverly Boulevard. Start with three shelves. That's what it was designed for.