Two truths, sort of.

Culvert, a photo by rjbeeswax on Flickr.

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poem by Tung-shan:

The blue mountain is the father of the white cloud.
The white cloud is the son of the blue mountain.
All day long they depend on each other, without being dependent on each other.
The white cloud is always the white cloud.
The blue mountain is always the blue mountain.

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According to the Dalai Lama there are two types of reality, neither of them exist independent of each other and are in fact, at base, one in the same. The first type of reality is Conventional Reality, this is the reality we see all around us everyday, the rock, the branch, the beer can, the friend, the mood, the thought.

In the world of conventional reality we see objects and things as existing independently from one another, we see our self as well as independently existing, not as an aggregate but as a independent entity, emerging from it's own source. To see that this is the way we see conventional reality is important insofar as being able to see this egocentric perspective so clearly means that we can see, at a more fundamental level, how mistaken it actually is. Don't get me wrong, it works fine in the conventional world, but in the bigger sphere, the ability to know everything exists dependently upon innumerable factors is essential if you want to grasp the concept of Ultimate Reality.

Understanding that there are two realities, the Conventional and the Ultimate lends itself quite well to two different aspects to understanding the path. One aspect is the Practice or methodological aspect, and the other is the Wisdom aspect.
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more on the Two Truths doctrine