The Juxtaposition Cross of Opinions is named for Gate 17 and Gate 18. Human Design reads Gate 17, from Hexagram 17, Following, sits in the Ajna and is read as logical opinions that want to be organised and offered to others; and Gate 18, from Hexagram 18, Work on the Decayed, sits in the Spleen and is read as an alertness to what is flawed and could be set right. Juxtaposition Crosses form their own family, belonging only to the four line one profile, and Human Design reads them as the tightest, least steerable of the three kinds.
Its design half is Gate 38 and Gate 39, both seated in the Root. Gate 38 is read as the drive to oppose, needing something worth opposing so the fight has a point; it pairs with Gate 28 in the channel of Struggle. Gate 39 is read as the pressure that stirs feeling in others, to discover whether there is any spirit in them; it pairs with Gate 55 in the channel of Emoting.
So a chart carrying this cross forms opinions and corrects flaws on its exposed surface, while beneath it a Root pair of opposition and provocation presses for a fight and a spirit worth testing. The hexagrams are ancient; grouping them into one incarnation cross is the modern system's own construction.