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The 4th dimension is fear, and if you could measure it, you could gauge the panic level in the market. If you could gauge the level of fear, not in decibels, but in how much price movement Bitcoin is likely to move in the future, it would give you a way to measure the fear. And if the level of fear is at an extreme, just like the screams and shrieks from an old-school squawk box, it means that traders are trapped — if prices reverse.