Change Z(height) of cubes based on point

Hello all,

I am fairly new to grasshopper, I have been googling and searching for a few hours now and I am at a loss still.

I want to create a array of cubes. ( I know to do this with grasshopper) What I do not get is how I could make the Z change in height in relationship to how close it is to the point.

So if one cube is right below the point it shrinks and the cubes further away are taller.

If needed I can draw up a basic idea if you do not know what I mean.


Thanks for the help!