Share 'inverting distances'

Im not sure if im being silly but my brain doesnt seem to be functioning properly atm.. I've used grasshopper a handful of times to do pretty simple operations but im now im trying to learn it more in depth.. i have two sets of grids one on the base plane and the second is attached to a new plane which has been transformed by a z vector and scaled. i have then drawn a set of lines based on the p…