A question that has puzzled the minds of many Mathematicians and Problem Solvers since 1966 posed by the Austrian-Canadian mathematician Leo Moser. He asked the following simple question. What is the largest solid object that can be moved around a right-hand corner in a corridor of fixed width. Sounds so simple to solve. But no solution to this problem has been found. The problem is known as the moving sofa problem in mathematics and is still unsolved today. The current best candidate is a strange irregularly shaped object such as a telephone receiver, that has been optimised for the action of pivoting.
Removal crews figured this out a long time ago without working out the math.
To move large objects like a sofa through small doorways, people use a variety of techniques to manipulate the object in space. One of the most common methods for moving large pieces of furniture is diagonal tilting, in which an object is stood on its side and pushed through a doorway with one end entering first, and then the object is rotated through the space as it is pushed through. This technique looks easy enough to learn and requires little practice, but in reality it requires a great deal of practice in order to execute well. In fact, people who are very skilled at moving large objects through small spaces are able to move objects through spaces with ease, and are able to execute complex maneuvers with little problem. These people have, through long practice, developed a sort of spatial intuition that allows them to read a space in a unique way. They are able to “read” a space in much the same way that a chess player reads a board of chess.
Experience suggests that, before one starts to manhandle a piece of furniture through a doorway, one should first ‘rehearse’ the journey along the length of the landing and decide how it will turn. (Will it be a right turn, for example, and will there be a radiator protruding from the wall in that section?) In some cases, the piece of furniture might even be designed to be detachable – as is the case with the legs of many sofas. In such cases, it is useful to be able to remove the legs in order to take the body of the sofa through the door, and then to be able to reattach the legs in the room at the far end of the passage.
Cheltenham’s a fascinating place for removals, with a load of Regency terraces, Victorian backstreets and long, tall sash-windowed houses, all creating narrow corridors of different shapes and sizes. For Removals Cheltenham, see express-removals.co.uk/removal-companies-near-me/removals-cheltenham/.
While it is possible that the problem of UDX will never be solved, in practice the largest object that can be moved through a corridor of given width and turn is a large sofa, which can be pushed through most doors.