Well, to see why, let's compare these two diagrams. Remember, when we have lateral diffusion the movement of these phospholipids doesn't actually break the net bonds between the water molecules and the polar heads. And likewise, the hydrophobic interactions within the tail region actually remains the same when they move along that horizontal direction. But what happens if a phospholipid like this one here actually wants to rotate? So in this diagram, we see that there is a stabilized interaction that takes place between the water molecules in the aqueous environment and the polar head. And likewise, we should always note, we should also note that there are also stabilizing interactions that take place between these adjacent sections here.