Some guy in rFactor (great racing sim) started making TrackMania-style tracks with loops, jumps, roads in the air, bankings, stuff like that - and if you use Formula cars, the whole thing is extremely thrilling. I see that NSR is trying to do something similar, and it even succeeds. And that's where real life racing like Formula 1 comes in play. Many people think that Formula 1, as the apex of racing, should really innovate. Toyota thought about that too, so they made a sort of a demo, based on proper calculations - Formula 1 cars COULD drive on ceilings, therefore on loops. The downforce generated by modern F1 cars is enough to keep a car on the ceiling if going at 300-350 km/h - speeds that modern F1 cars do indeed reach. So far, noone ever made something like that in real life - it costs a lot of money to build some kind of loop, and the safety required by F1 standards wouldn't let that happen - yet. But can you imagine a Formula 1 like this in like 10-20 years?

I am certainly thrilled by an idea like that. Back to NSR - featuring a fairly realistic driving model, it does prove something - if a Formula car keeps going at high speed, it can drive on the ceiling for a short period of time, thanks to the downforce. NSR is a futuristic racer, but it's one that does one thing right - confirms that these things CAN BE DONE, and while safety and money issues don't let them happen yet, I'm convinced this will be done sooner or later. As last words, the addition of the G force indicator in the car is really a good idea, as it really shows how does the weight of the car move when going through a loop.
P.S.: This sounds quite sci-fi at the moment, but think about it - it's possible.