Significance of draw creases in subsurf

Hi folks, I’m curious as to what the redeeming value is to the DRAW CREASES switch while working with subsurfs. What am I missing here? Thanks.

If you use Shift-E to make a crease in subsurface, then pressing that button will show what edges have been creased.

You can select a edge(s) and make a crease on your subsurfed model with shift-e. The “show creases” button displays which edges you have changed from the default value.

GreyBeard

Thanks. Now, while working on this tutorial here (which was where the subsurf thing came up): http://mediawiki.blender.org/index.php/Tutorials/Modelling_A_Cube

I’ve run across a problem I can’t understand. I’m trying out the “Make ‘real’ circles for the pips” option and I keep getting a different effect on the “to sphere” function. I’m following the instructions as listed, but so far I’ve wound up with this:
http://i75.photobucket.com/albums/i312/vidrazor/2-sphere.jpg

and I’m at a loss as to why they are all going in different directions, or none at all. Any thoughts? Thanks.