7. Chứa trong

Nguyên tắc con

1. Place one object inside another
2. Repeat the nesting: put that object inside yet another
3. Let an object pass through the cavity of another

Ví dụ

• Russian nesting dolls
• A telescopic antenna that collapses into itself
• Stackable measuring cups

Ứng dụng theo lĩnh vực

• mechanical: Cables routed outside a machine snag and wear. A hollow rotating shaft lets them run through its center.
• electronics: Tiny wireless earbuds are easy to lose and have small batteries. Storing them inside a charging case keeps them and charges them at once.
• medical: Opening a blocked vessel used to need a large incision. A thin tube is pushed along the vessel and a balloon or mesh passes through it to open the blockage.
• everyday: Camp cookware has many pieces and bulks up a pack. A smaller pot inside the largest, and cups and a stove inside that, pack down to the size of one pot.