7Nested doll
Place one object inside another; place each object, in turn, inside the other.• Measuring cups or spoons
• Russian dolls
• Portable audio system (microphone fits inside transmitter, which fits inside amplifier case)
Make one part pass through a cavity in the other.
• Extending radio antenna
• Extending pointer
• Zoom lens
• Seat belt retraction mechanism
• Retractable aircraft landing gear stow inside the fuselage (also demonstrates Principle 15, Dynamism).
This principle is proposed to solve the following contradictions:3/7 3/22 4/6 4/12 4/39 5/7 6/4 6/22 6/39 7/3 7/5 7/14 7/22 7/26 8/12 9/7 12/4 12/8 14/7 22/3 22/4 22/6 22/7 22/8 22/17 22/25 22/26 22/36 26/22 34/35 34/38 35/5 35/34 39/4 39/6 39/33