I don't know who discovered or named the law, but there is one that says however much stuff you own, it expands to fit the space you have, and then some. You can get rid of things, dump things, give away things, throw away things... and it just comes back.
The biggest problem is storing what we're not using at the moment, and that means anything from a yacht to a needle and thread.
Well... I don't have any solutions for yacht storage, sorry. But the needle and thread can be stored in a film canister.
Cardboard boxes are the common solution for storage, but where do you put the box after it's filled? You could cover it with contact paper, or paint it or wallpaper it or decoupage it and then you leave it out in plain sight. You can use it as a lamp table, a coffee table, a nightstand, or a footstool.
Besides boxes, cans - the kind we throw away - can store things. Many things don't need to be contained with a lid, so a plain steel ("tin") food can can be used. Before putting anything in it that you need to reach in for, use a pair of pliers to bend down any sharp edges and cover them with tape.
I was desperate for storage for my long knitting needles so I could find the size I wanted when I wanted it, so I covered a large oatmeal box with yarn wound around and around it and taped down at each end. It looks pretty good filled with those long knitting needles and I can easily see the sizes.
A large tub that cookies came in holds an assortment of hankies on my desk. Small glass jars with lids work as candy dishes, a large plastic spice container with holes in the lid holds baking soda for cleaning purposes, empty tissue boxes hold my hoard of plastic grocery bags.
And still there seems to be clutter...