The Invisible rendered Visible.
Place a coin in an empty basin, and let the basin be near the edge of the table. Ask one of the company to stand beside it, and to retire slowly backward until he or she can no longer see the coin. Then pour cold, clear water into the basin, and the person, who the moment before could not perceive the coin, now will see it quite plainly, though without moving a hair's breadth nearer.
THE COIN INVISIBLE.
THE COIN VISIBLE.