In the year 21*, the great Plutonian philosopher Phisophilopides expounded on the subject of love. Love, he explained, was most noble when the individual loved without the distraction of reciprocation: true love should not contain the expectation of love in return. This, he explained, would logically be most possible where there was no one to love, since a ‘loved one’ could only degrade the purity of love.
To demonstrate this, Phisophilopides locked himself in solitary confinement for his entire life, focusing instead on loving an imaginary Plutonian he could never meet. This, he declared, was the greatest love: plutonic love.
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(*21 is a long time in Plutonian years. Pluto takes a long time to get round the sun.)