So we have the Aqueous layer and we have that phospholipid layer. Now, to actually allow these phospholipids to spontaneously form these vesicles, these liposomes, what we have to do is we have to disperse these phospholipids within the aqueous solution. And in order to disperse these phospholipids, what we do is we basically undergo a process known as sonication. And what sonication does is it uses the energy that is stored in sound waves. So we essentially bombard our solution with sound waves and the energy stored within those sound waves basically disperses and agitates. The solution of phospholipids allows them to basically move around and disperse within the aqueous solution.