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The origin of the game
Logica, the riddle of pure reason
The tradition behind this game is as old as reasoning itself, yet startlingly modern in form. Its most famous example is known as the Zebra Puzzle, sometimes wrongly credited to Einstein. You are given clues that seem unrelated: this person lives in that house, that one drinks a certain drink, another is someone's neighbour. The only way to the single right answer is thought alone, neither luck nor intuition, just a consistent chain.
Such deduction puzzles became favourites of puzzle magazines in the twentieth century. Logic is a straight path: each clue eliminates a possibility, and when the elimination is complete, a single truth remains. This was Sherlock Holmes's method too, once you remove the impossible, whatever remains, however improbable, is the truth. There is no trick here, only patience and attention.
At House of Zij this pure reasoning takes on a celestial guise. You link the clues, eliminate the contradictions, and slowly light up the whole grid. Astrology is in fact a reading of the same kind: signs whose meaning is uncertain alone begin to speak only when set in relation to one another. A planet says one thing, but together with the aspect beside it, something altogether different. Logica lets you play that art of making connections.
Signs whose meaning is uncertain alone begin to speak only when set in relation to one another.