SDI is a virtual wall.
"SDI is a virtual wall."
That's a bit different, wouldn't you say? Can it be used on the border to keep illegals out? Let's tear down the physical fence around the White House. We'll put a virtual wall up to protect the President. Same with his bodyguards. We'll use virtual wall technology to protect him with. Why use real people? Israel should tear down its physical fence/wall and use a virtual one instead. The Chinese should never have built the Great Wall. The Romans, Hadrian's Wall. Why a virtual one would have done the same thing, don't you now? Real fences don't work, no really, they don't. That's just a figment of your virtual imagination.