>>1943470
>>1943474
Go to Map Overlays and select 'Shape'.
Here you can see here how the walls of this mountain are shaped.

Depending on the shape they have the wall will exude either 'Roundness' or 'Squareness' that will affect the citizens perception of them when they get close.
Blue aura is Round. Red aura is square. You can tell 'Squareness' is exuded by lines of straight, consecutive walls, while 'Roundness' is exuded by 1-block corners of them.

This applies on the same way to any artificial walls you build.
So Phallus shaped buildings should work, as long as you don't make the shaft too straight.