There is a certain level of dualism which can be found in Finnish tradition. It's not so much good vs evil, but more similar as can be seen with the yin and yang, for instance.
| Above | Below |
|---|---|
| Life | Death |
| South | North |
| East | West |
| White, bright | Black, dark |
| Warm | Cold |
| Trees with leaves | Trees with needles |
| The self | The other |
| Dressed | Naked |
| Clockwise | Counter clockwise |
| Right hand | Left hand |
| Right side out | Inside out |
| Waxing moon | Waning moon |
| Male? | Female? |
When it comes to male and female division, there is some evidence but it's not certain. Another thing, it is not good to conceive a child during a waning moon as it's connected to the "death side". While this "death side" represents the Underworld, the "life side" represents both this world and the heavens. I guess there was no point in differentiating between them as Finns were not super interested in the heavens: leaf trees are good for worship of both deities on this layer as well as the ones above.