Based upon the principle of structure: common properties connected.
“Imagine you have a house with a decent-sized closet. But the closet only has couple of hanging rods across the top and middle. Into this closet, you put all of your clothes, from shoes and socks, to suits and ties, sweatpants, your entire wardrobe. And you try to loosely organize the closet – given that all you have are hanging rods. You have a hanger for all of your ties (hanging haphazardly across the middle), you have a pile of socks in one corner, your shirts are on hangers, but placed randomly on the bars. You get the picture.”