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 is shown in light orange, and blobs with negative density is shown in dark orange at 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 a blob selected by dragging.
