It handles blobs which draw smooth faces by sticking or separating.
All operations for blobs like movement or polygonization are done with this command.
Blobs with positive density are shown in light orange, and blobs with negative density are shown in dark orange at the default setting. (Color can be set up in Configuration.)
It deletes 
clicked blob.
It copies a clicked blob by dragging.
It moves a blob selected by dragging.
It rotates a blob selected by dragging.
It scales up to a blob selected by dragging.
