The basic form of a block pillar church is a nave church, where the walls are made of horizontal logs and the joints between the logs are placed inside a timber pillar.
The pillars are square timbered cavities as high as the walls with interlocking joints and are visible from both outside and inside the church.
The pillars support a long timber wall so it doesn't start to buckle due to pressure from the roof.
In the west gable, the churches often have a timbered tower with a high spire.
[2] Media related to Block pillar churches at Wikimedia Commons