Kabbalah, the Tree of Life topologically explained
http://www.youtube.com/watch?v=UP6Jqq_Fk6M&feature=related
Nicely explained with the diagrams.
Parts of the Script - Basic idea of Tree of life

Three diamentional space -
The absolute creating three layers of itself to make three diamentional space.

Basic idea of Tree of life- Energy that is emanating in different kinds of structures, but still connected with the totality. Whatever comes out (the fruit) from the Tree, is made by the total system, like the seed needs the water and air to become the tree.

Each complete layer has three layers. With same principal we can make further three layers within each layer, that is the complexity of life.

Another video
The Tree of Life and how it works
http://www.youtube.com/watch?v=0F-6W2-aJes&feature=related
Script
The tree of life and the Chakra system works very well together. Tree of life can be explained in four levels.
Vegetable level - Basic survival needs, you eat and multiply, same as family.
Animal level - power struggle, joint soul, can't survive alone - need a master, to be loved and cared for, same as tribe.
Human level - Individuals, Free Will, discrimination, judgement, discernment; mercy, love and kindness; Beauty or Truth. Nature of Soul is how you make decision. Truth is beauty and Beauty is Truth.
Spiritual level - Your personal relationship with God and your chance to seek happiness. You can have whatever you conceive today.

I am impressed. Guru Nanak says Nanak Chuthe pade mai so jan gat pahe. I asked Guru Nanak today to tell me more about the Fourth Pad. I don't even know what there four pads are. So above is an interpretation until I find out another one.