How are these meshes being moved up while their origins are NOT moving? I watched a tutorial and at one point, the person moved their objects up the Z axis, but the origins did NOT move!



I watched the screencast keys, but I still can't figure out how it was done. 

Any ideas?
They are moving the geometry in Edit Mode.

Toggle edit mode with Tab, or select it from the header:


Select all geometry with A.

Press GZ to move the selection along the Z axis.