stop(),and others hover() at a predetermined completion point. Said approach engages finite time frame; once drawing period is over merely throb() or cycle() in *own* way. Development is finite, though some continue to move while others stop completely.
A developmental stage and then cycling stasis.
._opacity, ._length_of_developmental_stage, and ._general_rules. Multi-modal approach: dragging buttons, clicking and releasing, one movement sets all three:
._general_rules = which button ._opacity = vertical distance dragged before release {._y = (1/opacity)}._length_of_developmental_stage: This is not apparent.