Place the egg whites, salt, and vanilla in a bowl and whisk until frothy.
Gradually add the sugar while continuing to whisk, and then whisk to stiff peaks.
Trace 20 swans on a piece of parchment paper, making 10 left halves and 10 right halves. Flip the parchment paper over and place on a sheet pan, so that the side with the tracing is against the pan