The Fibonacci sequence is one of the most famous formulas in mathematics. Each number in the sequence is the sum of the two numbers that precede it. So, the sequence goes: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, and so on. As the numbers grow larger, the ratio of any number in the sequence to its predecessor approaches closer and closer to 1.618033..., a phenomenon that has earned the title of "the golden ratio (Phi)" due it's appearance in facets of the universe at all scales including all known life. Watch and read the following videos and articles to dig deep into the what, where, and why of the Fibonacci sequence and the golden ratio.

Watch the Khan Academy lesson on The Golden Ratio

Watch a quick video on The Fibonacci Sequence on YouTube

Read How to use the Golden Ratio in Design