Why my seamless textures still looked tiled

For about three weeks I have been rebuilding the floor of a small diorama scene in Blender: an old stone courtyard, wet after rain, with moss creeping into the joints. I expected the modelling to be the slow part. It wasn't. The slow part was the texture, and specifically the moment I tiled it across a four-metre floor and every repeat jumped out at me like wallpaper in a cheap hotel. What I learned is that "seamless" is a much stricter word than it sounds. A texture can have edges that technic...
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