"The evaluation of rooms is one the most important but rarely investigated questions in architectural psychology. This study looked into relation-ships between room size, relatively constant personlity factors, present moods, demographic variables, and room evaluation. The present mood of a subject was closely related to the evaluation of rooms, both real and ideal. The more balanced the mood, the more positive the judgment. Personality factors, demographic variables, and room size showed little or no relations to the evaluation of rooms. The results clarified the highly emotional nature of room evaluation. In environmental psychology little seems to be known about how differently people perceive rooms (cf. e.g. Wohlwill & Weismam, 1981, for overview). One can assume that the evaluation of rooms is a process that is different from the evaluation of other architectural objects, say facades, since we live and move in rooms. Rooms are a kind of "second skin". The objective of this study was to investigate empirically imdiosyncrasies of room perception and their relationship to personality. In particular the following was of concern: How does one describe the experience of rooms? Is room size, as one of the most important room features, correlated with room perception? Is the evaluation of rooms related to the present mood of a person? Do relatively constant personality traits influence room evaluation? Are age, sex, and profession influential factors? Which are more important, moods or personality traits? What characteristics do ideal rooms have and how do they correlate with demographic variables, moods, and personality?"