[Maxious]

There is more data than you see in the 2d map tiles but you can turn on the Map Data layer on the website or use an editor to see. Here is one of the ways that makes up the spires in the blog post http://www.openstreetmap.org/way/227682021

You can read more about the properties used to make up a complex structure here https://wiki.openstreetmap.org/wiki/S3DB