How do I get that swirly effect on cupcakes?

[MrsD]

I have a 1M decorating tip and I used it to decorate my cupcakes, but my swirls looked flat and did not have that slight peak that I see on cupcakes in the bakery. I read somewhere that you create one swirl and then another one on top of it. I am confused. Does that mean I create an entire swirl and then start at the base of where I started with another one, or does that mean I pipe a swirl around the edge and then pipe a new swirl in the middle? I guess I need it broken down further because without actually seeing someone do it, its tricky to figure out.