Some people like to create a vortex to help the whites wrap around the yolk. This isn’t necessary and has a few downsides: you can only poach a single egg using this method and the aggressive vortex tends to create more ragged bits on the eggs surface. However, gently swirling the water along the pot’s edge for 10 seconds after the egg has been added can be very helpful to shape the egg as it begins to set.