drawOn:

morphicLayerNumber

helpful for insuring some morphs always appear in front of or behind others.
smaller numbers are in front

opaqueBackgroundColor:

revealingStyle

>>>>
1 = original, no change after 100%
2 = hold at last 25% and blink until done
3 = wrap around from 100% back to 0 and go again. change color after first
<<<<