I have hacked up a booth-by-booth visualisation of votes in Wellington Central. The visible (non-occluded) area of each circle is proportionate to the party vote received, and the circles proceed inwards from most votes. It only shows the top
three five parties at each booth at the moment (from skimming over the data, further down than that they become negligibly small). It’s not really as interesting as I’d hoped, but I may try it on other electorates that might show something better later on.
Update: I’ve extended it to the top five, rather than three, parties, and it gets a little more interesting then. The fifth-place party varies quite a bit.
Update 2: More electorates: