Tree test was developed by Karl Koch and used as a diagnostic tool since 1928.
Drawing of a tree reveals and reflects a person's personality. The drawing
can be analyzed and tells us about the person's strengths, wishes, moods, past experiences and more.

When a person enters the world he is fragile and entirely dependent.  With time and the right care the person develops strength and the ability to combine his own unique personality with the influence of his parents and his environment, so that he can find his own place in society.

Man and tree have many similarities.
They start off fragile and dependent on their roots.  Through sunshine and storms they became stronger.
Even though we cannot see the roots we can imagine their strength by looking at the tree, it's trunk, branches, leaves and fruit.