Since traditional criteria for window design, e.g. the daylight factor, have lost their force, interest in re-evaluating the function of windows has been growing rapidly. The concept of spaciousness as an alternative criterion is introduced, and observations in scale models differing in spaciousness under an artificial sky have been carried out. From these, spaciousness for different sky luminances has been shown to be a function of interior illuminance, room size and window size. Observations in full scale interiors were also made to confirm the validity of the results. From additional experiments, it has been found that a lower limit of just acceptable spaciousness does exist. This would be a useful criterion for use in design.

Recently in Ihe community of lighting fie ］ d， people tend to attach great importance to the qualitative aspect of Iighting environment ． Going with this trend， it is very essential for tighting planners and designers to be fully conscious of ' 「 Direction ofLight " as well as ' 「 DensitY ofLight " in interiorspaces ， This paper first brought into focus ' 1Light Distribution Pattern ' 「 people sense orfeel with theirown eyes ． In second place ， ' ℃ ubic Mode ］ " of lighting envirQnment was proposed to aim at giving the systematic expression ofdistribution pattern ． In addition to that ， a series of numeral s3mulations were caTried out 宣 o apply the proposed model tQ some virtual spaces ． In conclusion of the study ， the following two possibi ］ ities or advantages of ℃ ubic Moder ' were cleared ：

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