Alien Arm

Alright when I set smooth my mesh these lines appear and I’m wondering what I’m doing to cause this effect, I just started using Blender a couple of weeks ago and I know most of the functions and terms but i have no clue why im getting this effect. The fist picture is the undesired effect, the second one is subsurfed, and the thrid is a wireframe if that helps?

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It looks like some of the face normals are inverted. In Edit mode, Select All and hit CTRL+N => Recalculate Normals. It happens sometimes that the software doesn’t know which way is up(or rather, out).

Thank you! That did the trick.

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odd arm… just out of curiosity, what kind of alien are you planning to make?