About your first question:
Taoism has always been known as the "Big Four". "The Tao is big, the sky is big, the land is big, and the people's congress is big."
In other words, the four things are very important.
The theory of "three talents" since ancient times means that "heaven, earth and people" are the most important things in the world.
But although these four things are all important, their relationship is not equal: people should imitate the mellow earth, the earth should imitate the vast sky, and the sky should imitate the infinite Tao, which is natural and has no room for imitation.
About your second question:
Man-made, emphasizing the importance of "people".
Since ancient times, there has been a Taoist saying: "My life is immortal in my absence." That is to say, when people have the right opportunity and master the correct theory and cultivation methods, they can break through the limitations of the universal "human" and finally "be in harmony with heaven".
However, this breakthrough is conditional and can only be said to be "artificial" under certain conditions. There is no contradiction with "people everywhere, the earth follows the sky, the sky follows the Tao, and the Tao follows nature". In other words, only the "human law" has really been realized.
It is possible to realize "artificial nature" step by step.
I hope it helps you.