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1939 Pontiac Ghost Car commands $308,000 at auction

For the 1939 World's Fair, Pontiac built a Deluxe Six bodied in Plexiglass. Part of the Previews of Progress pavilion in which General Motors' Futurama showed off what was to come in the world of autos, the 'invisible' Pontiac is credited as the first transparent car in America. And there were no shortcuts taken with its body: the Plexiglass form was fabricated by the company that brought the material to market in 1933, Rohm & Haas.
The see-through sedan was sold at RM Auctions' St. John's auction in Michigan on July 30, fetching $308,000. Not bad appreciation for a domestic oddity that cost $25,000 to build when new. You can check out the high-res gallery of its innards, including copper and chrome metalwork and white moldings and wheels, and get the exhaustive details on it after the jump.

Best and Worst GM Cars

Oh yes, because we just love receiving angry letters from devoted Pontiac Grand Am enthusiasts, we have decided to go there. Based on a heated group Slack conversation, the topic came up about the best and worst GM cars. First of all time, and then those currently on sale, and then just mostly a rambling discussion of Oldsmobiles our parents and grandparents owned (or engineered). Eventually, three of us made the video above. Like it? Maybe we can make more. Many awesome GM cars are definitely going unmentioned here, so please let us know your bests and worsts in the comments below. Mostly, it's important to note that this post largely exists as a vehicle for delivering the above video that dives far deeper into GM's greatest hits and biggest flops, specifically those from the 1980s and 1990s. What you'll find below is a collection of our editors identifying a best current and best-of-all-time choice, plus a worst current and worst-of-all-time choice. Comprehensive it is not, but again, comments. -Senior Editor James Riswick Best Current GM Vehicle Chevrolet Corvette We were flying by the seats of our pants a bit in this first outing and my notes were similarly extemporaneous. When it came time to tie it all together on camera, I failed spectacularly. Thank the maker for text, because this gives me the opportunity to perhaps slightly better explain my convoluted reasoning. I chose the C8 Corvette because it's simply overwhelmingly good, and it's merely the baseline from which this generation of Corvette will be expanded.  While the Cadillac CT5-V Blackwing (more on that in a minute) is an amazing snapshot of GM's current performance standing and its little sibling so enraptured me that I went out and bought one, their existence is fleeting. Corvette will live on; forced-induction Cadillac sport sedans, not so much. So while all three are amazing machines when viewed in a vacuum, the Corvette stands above them as both a reflection of GM's current performance credentials and a signpost of what is to come. So, given the choice between the C8 and the 5V-Blackwing right now, I'd choose the C8. In 10 years, when the Blackwing is no longer in production and Corvette is in its 9th generation? Well, that might be a different story. Now, just pretend I said something even remotely that coherent when we get to the part of the video where I try to make an argument for the 5-V Blackwing as best GM car I've ever driven. Or just laugh at me while I ramble incoherently.

'We're not a hedge fund': Porsche plans to curtail speculators and flippers

A sizable number of speculators view cars as an investment. Rare or unusual models are quickly snapped up and either parked for years or flipped for a profit. Cars from automakers like Porsche and Ferrari are more prone than others, and at least some people behind these models are getting a bit tired of it. While it's difficult to police what goes on after you sell a car, Porsche has some plans that might curtail the problem before it starts. Andreas Preuninger, the head of GT road-car development and the man behind the new 911 GT3, spoke to Car and Driver at a recent event. "I personally like to see my cars being used," he said. "That's what we build them for. They are just too good to be left to stand and collect dust." One recent example of this rampant speculation is the 911 R. While the special manual-only model sold for $185,950 when new, used versions were selling for nearly $1.3 million just months after it went on sale. While the car is a masterpiece and an instant classic, a good number will be parked and simply used as art and not the rolling testaments to the man/machine interface they were intended to be. The concern over valuations has become so fierce that some owners are upset that Porsche is offering the new 911 GT3 with a manual transmission, fearing that it may hurt the value of the 911 R. "When I said we're not a hedge fund, I'm talking to those people who are yelling at us for offering the manual transmission similar to the R," Preuninger said. "But if there are people wanting to buy cars like that, then as a company we should try to fulfill that, to meet that demand." It seems Porsche is keeping a close eye on who is flipping cars. Since there is often far more demand than supply with certain models, the German automaker has a name for every car before it's built. Buyers with bad reputations might not even make the wait list. Related Video: