Modifiers

Twist - What the twist tool do is to turn a object around, you can see the picture at the left, the first blue object is twisted.












Taper - The Taper tool is to make a edge longer, as you can see the picture at the left the second object. The top edge of the back face is longer then the bottom edge.













Bend - The Bend tool is very simple, is to bend a object. You can see that the picture at the left, the third blue object is bended.











Shell - The Shell tool is to delete the faces you selected also the face at the back. The picture at the left i've created a sphere and half of the faces is deleted. Normally when you selected some faces on the front of the sphere and you deleted the faces it only delete the faces you selected, but with the Shell tool it also delete the faces at the back of the sphere








There is  white object in the picture at the left. I've mix all the 3 tool together, twist, taper and bend.