Once, I sat by the side of the road, and watched a great, big truck deliver the two halves of a house that was being relocated from a different spot. They cut it down the middle and brought it down one half at a time, because the house was so very big. And they lay down the halves so carefully, shifting an inch in this direction, an inch in that...until the halves lined up perfectly. And then they sealed them together so that there was a seam running right down the middle of the floor.
I loved watching them move that house. I never imagined I would live there, myself, some day. But I did.
The hallway had freshly-laid wall-to-wall carpeting. The day I moved in, I took off my shoes and took a walk all the way up the long, long hallway. Barefoot. And, through the thick carpet, I could feel the seam where the two halves of the house were joined. Thick shag couldn't hide that seam from me. It was our secret.