...arranged in the Likeness of Man... The overall order goes not only on the basis of the number ten but on the basis of ten in all the orders of their different states and individual details. This is called the Likeness of Man (דמות אדם, demut Adam) – the number ten signifies the form in which man is made, which divides up on the basis of ten. For these orders can all be explained in accordance with the Likeness of Man, for they actually correspond to the human form in all its particulars.
Indeed, they are the actual cause of the human form in all its particulars. They are even the cause of the very name Adam, inasmuch as they unfold in a certain order which is called Adam – the name of HaVaYaH in which the constituent letters are “filled” (spelled out in full) with alephs: יוד הא ואו הא = 45 = אדם, ADaM. This expansion of the Name consists of ten letters, yet they are all included in four, namely the four “simple” letters, which make ten when they are “filled”.
It is through all these pathways that this Tree is understood in all its laws. And this first order in the Likeness of Man...is called Adam Kadmon.