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The text in the sphere is taken from several articles of the Spanish Wikipedia. In the center is a quote taken from the first version of the Special relativity.

"La Teoría de la Relatividad, publicada por primera vez por Albert Einstein en 1905, describe la física del movimiento en ausencia de campos gravitacionales. Antes de ella, la mayor parte de los físicos pensaban que la mecánica clásica de Isaac Newton describía los conceptos de velocidad y fuerza para todos los observadores (o sistemas de referencia). Sin embargo, Hendrik Lorentz entre otros, habían comprobado que las ecuaciones de Maxwell, que gobiernan el electromagnetismo, no se comportaban de acuerdo a las leyes de Newton cuando el sistema de referencia cambia (por ejemplo, cuando se considera el mismo problema físico desde el punto de vista de dos observadores que se mueven uno respecto del otro."

Source:Diff "Teoría de la Relatividad" del 11 de enero de 2003. Wikipedia en español.