This book isCommon sense written in plain languageLanguage, with pictures because pictures do not lie. DiversityDiversity is common senseCommon sense. With this book I invite the reader to questionQuestion every new slogan, to separate jargonJargon from common senseCommon sense, to detect coincidencesCoincidences, to questionQuestion what caused them, and to draw conclusions that benefit the reader, the individualIndividual, and futureFuture generations. This chapter is a pictorial introduction to the physicsPhysics of all the moving, changing, and predicting that go on in natureNature and scienceScience. I called it Common SenseCommon sense because it is addressed to everyone. It is without mathMathematics, Math, no jargonJargon. It is about the directionality that sustains the multitude of dynamic and changing phenomenaPhenomenon called natureNature. The single word for all such descriptors is evolutionEvolution. What causes diversityDiversity? I address it in terms of the effect of more freedomFreedom on anything that moves, flowsFlow, morphs, and evolves toward moving more easily, farther, and longer in time. FreedomFreedom enables the moverMover (riverRiver, animalAnimal) to keep the feature that helps accessAccess, and move on. A small deviation from perfectionPerfection saves time and assures progressProgress and persistence. DiversityDiversity abounds naturally in the broadband of slightly imperfectImperfect, Imperfection designsDesign. This way we discover how diversityDiversity is born, inevitably, steadfastly, and beneficially.