Peter Eisenman's Berlin/Holocaust memorial Light and Shadow. I like the way the structure of the building creates strong impressions of light and dark. Also the juxtaposition between the natural and man-made forces interests me.
In Arabic architecture light (and shadow) play such an important role in making the impact of a space. Later in the day the sun will strike the fence on the left and will make a totally different patterned shadowplay. 486 Mina El Hosn by LAN Architecture.