Hello.
I'm just playing around with bump maps and noticed something. It seems as if the bump strength changes with the size of the object (or amount of 2D transformation). In the image below you can see a closeup of two planes. The left one has a side length of 6cm, the right one 60cm (10 times as much). They both are assigned the same material, except for the 2D Transformation that scales the size of the bump map is adjusted to match the scale. Somehow the bump map is stronger on the larger plane. What could be the reason for that? I also attached the version in Cycles, where the bump strength is the same in both cases (blue material). I've also attached the notes that I used.