What has always astonished me about the city centre, as Amelia noted, is the amount of layering. In which ever direction you look, the skyline is made up of layers of new and old, red brick and glass, ornate lettering patterns and flush mirrored fronts. There is little coherency throughout Leeds City Centre and things seem to pop up in a slightly hap-hazard fashion, so wherever you look you see patchworks of overlapping materials, shapes and designs.
I am also always struck by the amount on clocks there are in the city centre....! Here are a few examples - the post office one has an interesting reflection, reflecting back into the city behind.