"Rolling a Reliant Robin" — BBC's "Top Gear"

Wrote reader Fred in a comment on last week's post entitled "Why is a 3-legged-stool more likely to be steady than one with 4," "If a 3-legged stool 'solves' a system of three equations in three variables, a 4-legged stool 'solves' a system of four equations in four variables (think of a diamond shape rather than a square). It's absurd to think of a 3-legged stool (or ladder) being inherently more stable than a 4-legged one. [Here is] an entertaining demonstration."

Hard to argue with that, what?