She tells us that in the VIP guest lounge, there's a mock up of a gleaming city of the future.

NPR: Darfur Casts Shadow Over Khartoum's Ambitions

To demonstrate the vulnerability, the Department of Homeland Security and Idaho National Laboratory in Idaho Falls recently showed reporters a cyberattack on a mock-up of a chemical facility.

CNN: Inside a government computer attack exercise

There's a classic neon McDonald's sign, a scale model of an old Texaco service station where kids can play at fixing a car and a mock-up of an early Holiday Inn, complete with cheesy laminated coffee tables.

WSJ: The Henry Ford Prepares a Museum Makeover

This technique even allows us to see a three-dimensional object such as a mock-up of running person.

CNN: A camera that can see around corners

About a dozen active-duty Navy Seabees helped law enforcement authorities build a mock-up of the bunker that was used to plan the assault.

WSJ: Military tactics, arms, helped rescue Ala. hostage

Control-room operators, in a mock-up of a real off-shore control room, can be trained to deal with a range of tricky situations including explosions, leaks of poisonous gas and oil-well blow-outs, without the risk of so much as a scratch.

ECONOMIST: Virtual reality

Stonegate Advisors LLC, a research firm that works for health insurers, has been testing clients' plans with consumers in a mock-up version of an exchange, which is an online insurance marketplace.

WSJ: Hospitals Forge New Deals With Insurers

Scientists in Riga at the Institute of Physics at the University of Latvia are continuing to work on a much more physical mock-up of the core.

BBC: Planet Earth

It's a hand-carved mock-up of the original.

FORBES: Michelangelos: Made in Japan

There was, for example, "Slider House Rules, " a mock-up where a single Web page represented a year of a user's life that could be flipped through by a sliding motion.

WSJ: Facebook's New R&D Machine