if you take a REALLY close look at the columns, you'll notice that there are 6 spines on either side of the column and the bulls head corresponds with one level of those spines. starting with the first switch, the bulls head will be on top, and (even though its kind of tough to make out for the ones facing away from you) the bulls head is one level lower on the successive columns until the 6th one which is at the bottom of the column.
