Daemon - J. Morisson's grave

James Douglas Morrison (December 8, 1943 – July 3, 1971) was an American singer, songwriter, and poet, best remembered as the lead singer of the Doors. Due to his poetic lyrics, distinctive voice, wild personality, performances, and the dramatic circumstances surrounding his life and early death, Morrison is regarded by both music critics and fans as one of the most iconic and influential frontmen in rock music history. Morrison was buried in Père Lachaise Cemetery in Paris, In the early-1990s, Morrison's father, after a consultation with E. Nicholas Genovese, Professor of Classics and Humanities, San Diego State University, placed a flat stone on the grave. The bronze plaque thereon bears the Greek inscription: ΚΑΤΑ ΤΟΝ ΔΑΙΜΟΝΑ ΕΑΥΤΟΥ, literally meaning "according to his own daemon, i.e., guiding spirit," to convey the sentiment "True to Himself."

In the ancient Greek religion, daimon designates not a specific class of divine beings, but a peculiar mode of activity: it is an occult power that drives humans forward or acts against them: since daimon is the veiled countenance of divine activity, every deity can act as daimon; a special knowledge of daimones is claimed by Pythagoreans; for Plato, daimon, is a spiritual being who watches over each individual, and is tantamount to a higher self, or an angel; whereas Plato is called ‘divine’ by Neoplatonists, Aristotle is regarded as daimonios, meaning ‘an intermediary to deities' – therefore Aristotle stands to Plato as an angel to a deity; for Proclus, daimones are the intermediary beings located between the celestial objects and the terrestrial inhabitants.

Daemon  Wikepedia

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Mount Athos

An Orthodox spiritual centre since 1054, Mount Athos has enjoyed an autonomous statute since Byzantine times. The 'Holy Mountain', which is forbidden to women and children, is also a recognized artistic site. The layout of the monasteries (about 20 of which are presently inhabited by some 1,400 monks) had an influence as far afield as Russia, and its school of painting influenced the history of Orthodox art.

UNESCO World Heritage mount Athos

Ring of Gyges

The Ring of Gyges is a mythical magical artifact mentioned by the philosopher Plato in Book 2 of his Republic (2:359a–2:360d). It granted its owner the power to become invisible at will. Through the story of the ring, Republic considers whether an intelligent person would be moral if he did not have to fear being caught and punished for doing injustices.

Delian problem

The problem owes its name to a story concerning the citizens of Delos, who consulted the oracle at Delphi in order to learn how to defeat a plague sent by Apollo. According to Plutarch it was the citizens of Delos who consulted the oracle at Delphi, seeking a solution for their internal political problems at the time, which had intensified relationships among the citizens. The oracle responded that they must double the size of the altar to Apollo, which was a regular cube. The answer seemed strange to the Delians and they consulted Plato, who was able to interpret the oracle as the mathematical problem of doubling the volume of a given cube, thus explaining the oracle as the advice of Apollo for the citizens of Delos to occupy themselves with the study of geometry and mathematics in order to calm down their passions.

Doubling the cube, also known as the Delian problem, is an ancient  geometric problem. Given the edge of a cube, the problem requires the construction of the edge of a second cube whose volume is double that of the first, using only the tools of a compass and straightedge.