Do not call the tree as a tree. De-condition your mind by entering into the concept of the form of the tree without bringing in the name, or the word, tree . We are so much familiar with names, and so much engrossed in their reality that we would not find this an easy affair. We cannot think of a tree without imagining that it is a tree, verbally also. It requires a little bit of the power of the will backed up with a sustained understanding, the understanding that there is no need to name an object.
Objects have really no name.
This is a clear understanding, and there should be no difficulty about it. If the understanding is stable, the will would take care of itself. The concentration on an object, a tree, or any such thing, should be a mutual contact of the pure subject with the pure objectivity of that on which one concentrates. As the object need not have a name, we human beings, too, have no name. The first step in this meditation is to dissociate oneself from one s own name and also the object from its appended name.