Normaalikulmaa

Normaalikulmaa refers to a right-angled triangle in a Finnish-built sauna, specifically one with a remarkable property. In such a triangle, a chalk line, typically drawn on the walls, crosses the other two lines at their midpoints. This results in two smaller triangles with angles, typically denoted as 30-60-90 and 15-75-90.

The trait seems to be a result of a design decision during the construction process. Presumably, the craftsmen who built the sauna used the 'normaalikulmaa' property to check the accuracy of their work. It's a convenient method to verify the squareness of walls and corners, thus ensuring the structural integrity of the sauna.

Some sauna owners have found this design feature to be aesthetically pleasing, incorporating it into their sauna's interior design. Additionally, the 'normaalikulmaa' property has been observed in various customs and superstitions surrounding Finnish saunas.

The 'normaalikulmaa' property is not unique to Finnish-built saunas and can be achieved in other constructions as well. However, it is the significance of this trait within Finnish sauna culture that makes it a notable aspect of saunas from this region. The origin of the term 'normaalikulmaa' is unclear, but its widespread use among Finnish sauna enthusiasts suggests a long-standing history and appreciation for this design choice.