In this dissertation, I will examine the difference of the quality of light of the two buildings’ staircases designed by Mackintosh and Steven Holl. Both staircases are located at the centre of the buildings and are considered as the feature of the buildings. These staircases are indispensable to students for their daily lives since these enable them to reach the multiple stories that comprise the two buildings. The methodology of this dissertation is an analysis of experience and measurement. Last December 2013, I visited architectural sites in France, Spain, and Portugal. There, I was able to have a pilgrimage of light that gave me a remarkable experience. To better examine and analyse the light of the two staircases, I took photographs of light and conducted some light measurements. Through these experiments and the several experiences that I had in the staircases, I tried to discover the difference of the quality of light of the two staircases.