He has perfected a technique of etching letters onto microscopic surfaces-including the tip of a screw, the head of a pin and the pointed end of a paperclip.
他已练就了在微观物体表面雕刻字母的绝佳技艺，包括雕刻螺丝钉的尖端、饰针的顶部和曲别针的尖端。
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Fill the jar with rice and a few secret objects like a coin, a paperclip, a button, a bead, a small toy, dice, etc and have kids see if they can find all the treasures.
And onto the pointed end of a standard paperclip he managed to fit Shakespeare's "all the world's a stage: and all the men and women merely players," from As You Like it.