@duerer maybe this helps:
The Mapping Node (Type Point) doesn’t move points, but ‘maps’ them to other points; meaning that when point A gets mapped to point B, it stays where it is, but gets ‘all’ the properties from point B (apart from Location…).
So, in our little example, point (1/7, 0, 0) gets first mapped to point (1, 0, 0), meaning it gets, amongst others, the property ‘lies on a sphere with center (0, 0, 0) and radius 1’. Rotating it 90° around the Y-axis will map it to point (0, 0, 1), which happens to also have the property ‘lies on a sphere with center (0, 0, 0) and radius 1’.
