Styles come and go. Some endure, others are best left to rot in Bergdorf Goodman's basement. Same thing with cars. Some styles look dated immediately, others' looks endure. What car design has stood the test of time?

Maybe it's because Henrik Fisker looked to classic sports cars when he penned the BMW Z8, but let the record show that the 8's styling keeps on giving, a decade on. Maybe that's helped the Z8 retain most of its value, while other sports cars depreciate like day-old quiche. It's also rare. What else?

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