push rods

i found this page at comp cams but i still have a little hard time grasping how the rocker rolls from the intake side at base then to center at mid lift then the exhaust side at max lift. it seems to be backwards it seems to me it would start at the exhaust side and travel to the intake side?http://www.compcams.com/information/Products/Pushrods/ please forgive me but this "simple" thing driving me nuts!!!