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The image of the world around us, which we carry in our head, is just a model. Nobody in his head imagines all the world, government or country. He has only selected concepts, and relationships between them, and uses those to represent the real system.

5 Mental Models That Help Product Managers Acquire and Retain Users

Hiten Shah

Tesla amazed the millions of fairgoers by allowing electricity to flow through his body to illuminate light bulbs. He also used his coils to shoot large, harmless lightning bolts into the crowd, frightening and delighting the audience. He even demonstrated wireless energy by lighting lamps that had no wires.

Nikola Tesla

Sean Patrick

**6. Good Design is unobtrusive**     Products fulfilling a purpose are like tools. They are neither decorative objects nor works of art. Their design should therefore be both neutral and restrained in order to leave room for the user’s self expression.

TEN PRINCIPLES FOR GOOD DESIGN

R / D

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