The house-tree-person test is based on the idea that drawings reflect feelings. The details of a drawing are seen as representations of various personality traits. 

Drawing a house

The house is considered to be the expression of the respondent’s family relations and family values. 

• The roof stands for the intellectual side and spiritual life of the individual.
• The walls might be related to the test taker’s character strength.
• The doors and windows represent the individual’s relationship to the outside world and the level of social integration.

Drawing a tree

The tree is thought to suggest the deepest, unconscious aspects of the personality.

• The branches may show the degree of social connectedness. A tree with no branches indicates, for instance, that the person has little contact with others.
• The trunk is often seen as a representation of inner strength.
• The tree crown stands for ideas, thoughts, and self-concept.

Drawing a person

The person is a symbolic representation of the ideal self and one’s social interactions.

• The head symbolizes intelligence, communication, and imagination. 
• The eyes indicate the perception of the world.
• The hands give information about affectivity and aggressiveness. 

There are several other aspects of drawings that therapists take into account when analyzing HTP tests:

Dimensions of objects 

The dimensions of objects in a drawing are thought to indicate the level of self-esteem and confidence. A very small house, for example, might show the individual’s dissatisfaction with life at home. 

Level of detail

The level of detail is another revealing factor in outlining the respondent’s personality through drawing. A very detailed face might indicate a need to present oneself in a favorable social light. On the contrary, pictures lacking details often indicate depression.

Location of objects 

The location of objects on the page is also charged with significance. Drawings close to the top of the page are considered being related to dreams and imagination, while the ones at the bottom are connected to the physical world. Drawing on the right side of the page is linked to the future, in the center are related to the present, and left to the past.

Strokes and lines 

The pressure, firmness, and solidity of strokes and lines indicate determination and decision-making facilities. The same line drawn twice shows insecurity, dissatisfaction, or perfectionism. Emotional strength, high self-esteem and confidence, on the contrary, are reflected in the firmness of the lines.