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In 1905 the well-known physicist Max Planck was coeditor of the Annalen derPhysik, and he accepted Einstein's paper on light quanta for publication, eventhough he disliked the idea of "light quanta". Einstein's relativity paper wasreceived by the Annalen der Physik at the end of June 1905 and Planck was thefirst scientist to notice Einstein's relativity theory and to report favorablyon it. In the 1905 relativity paper Einstein used a seemingly conventionalnotion, "light complex", and he did not invoke his novel quanta of lightheuristic with respect to the principle of relativity. He chose the language"light complex" for which no clear definition could be given. But withhindsight, in 1905 Einstein made exactly the right choice not to mix conceptsfrom his quantum paper with those from his relativity paper. He focused on thesolution of his relativity problem, whose far-reaching perspectives Planckalready sensed.

The 1905 Relativity Paper and the "Light Quantum"