I’m not sure that I’ve seen an image like this before, but it’s a snapshot of how much stonework has been replaced at Lübeck Cathedral over the years. I’ve written about the four construction and engineering problems of the cathedral which has caused this situation, but there has been plenty of stone replacement over the centuries.
In the above image, the various colours show how old the stonework is. There’s not a huge amount of the original late twelfth century stone and what survives is mostly in the middle. I’ve often wondered just how old some buildings actually are because of all the restorations that take place and this gives about a precise answer to that as possible.