If you've ever been in the midst of reading some description of new car design, and had to stop to find the "Tumblehome" page on Wikipedia, we don't blame you. The term (like so many) is a carryover from the nautical world and ship building, and is used to describe the inward slant of a vehicle's greenhouse.

Starting with the salty origins of the folksy sounding piece of design jargon, Autoline Detroit's Jim Hall takes on a journey from past to future, explaining how the shape of a car's tumblehome has evolved throughout the years.

Close that dusty old dictionary and scroll down below to follow along with Mr. Hall and the rest of the class.

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