7. Nested Doll
A. Contain the object inside another that, in turn, is placed inside a third object.
Example:
• Website.
• Measuring spoons.
B. Pass an object through a cavity of another object.
Example:
• Camping cup.
• Telescoping antenna.
• Chairs which stack on top of each other for storage.
• Mechanical pencil with lead stored inside.
• Zoom lens.
• Seat belt retraction mechanism.
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