The Juxtaposition Cross of Extremes carries the same pair as the Left Angle Cross of Prevention, Gate 15 and Gate 10, read here inside the fixed Juxtaposition family instead. Human Design reads Gate 15, from Hexagram 15, Modesty, as a love of humanity broad enough to embrace extremes, now the more exposed gate, and Gate 10, from Hexagram 10, Treading, as conduct that stays true to one's own nature rather than to expectation. Juxtaposition Crosses stand apart from the Right Angle and Left Angle families entirely, tied only to the four line one profile, and are read as the most fixed direction the system names.
Its design half is Gate 17 and Gate 18. Gate 17 sits in the Ajna and is read as the forming of opinions, logical viewpoints seeking to be organised and offered to others; elsewhere it pairs with Gate 62 in the channel of Acceptance. Gate 18 sits in the Spleen and is read as a corrective instinct, an alertness to what is flawed and could be set right; it pairs with Gate 58 in the channel of Judgment.
Where the Left Angle reading of these same four gates serves something handed back by circumstance, the Juxtaposition reading holds the pair as fixed rather than assigned, tolerance for extremity bound tightly to a single profile while a questioning mind answers to a corrective instinct beneath it. The hexagrams are old texts; grouping them into one incarnation cross is the modern system's own construction.