Content Comparison

Aqua color / nurbsCurve objects

To place deformer pivots on the proper position.

Size up or down
(not necessary)

Not allowed to change move components and swith shapes.

_placer

Aqua color / nurbsCurve
objects

To design your shapes of rig ctrls

+

placer purpose

You need to do,
By size up or down,
tweak curve points.
Not allowed to change switch shapes.

_ctrl

Grey color / nurbsCurve

objects

To design your shapes of rig ctrls

You need to do,
By size up or down,
tweak curve points.Size up and down by moving curve points(components)
Not allowed to change switch shapes.

_ctrl

Dark yellow / nurbCurve

object

To adjust a guide,
generally, it is supposed to match to your target mesh

Scale up, down,

Rotate, Translate

Not allowed to move components and swith shapes.

_guide