And their persistence in the ocean, where the currents would be expected to break them up pretty rapidly, is also amazing.
Funny you should say that; I saw a minor news article that in Indiana, there's a National Historical Site where Studebaker planted trees that spelled out "Studebaker". Apparently as the trees are growing bigger, the letters are starting to get blurry, so they're talking about cutting down the trees.
Studebaker Proving Ground (old picture)
Washington Times short (go about halfway down