Gospel Wand by Ickle Pickle
A clear tube is shown with some sand in the bottom representing man. One tip of the tube is Black representing sin, the other Red for Jesus' Blood, and a Gold band in the middle for God's Law.
While the tube is held vertically with black at the bottom, he sand barely fills one quarter of the tube, nowhere near reaching God's "Gold Standard". But when it is turned over to lean on Jesus instead of "self" the sand multiplies before your eyes fulfilling the Law, and granting righteousness to the believer.
This illustration is simple enough for anyone to perform. It includes