The Right Angle Cross of Penetration, named here in its reverse order as Gate 57 and Gate 51, carries the same two gates as its better known counterpart with sun and earth exchanged. Human Design reads Gate 57, from Hexagram 57, The Gentle, as intuition in the present moment, read through hearing rather than sight, now the more exposed of the pair, and Gate 51, from Hexagram 51, The Arousing, as competitive courage that goes first and can startle others awake. It belongs to the Right Angle family, and the system reads that group as personal destiny, answering mainly to the individual's own choices rather than to any role imposed from outside.
Its design half is Gate 53 and Gate 54, both in the Root. Gate 53 is read as the pressure to begin, an impulse that starts new cycles and often has no interest in seeing them through; elsewhere it pairs with Gate 42 in the channel of Maturation. Gate 54 is read as ambition, the drive to rise and transform one's material circumstances; it pairs with Gate 32 in the channel of Transformation.
Exchanging which gate carries the Sun changes what the cross puts forward first, intuition rather than shock, but the underlying material, a Root pair of beginning and ambition, is identical to the cross's better known form. The hexagrams are ancient; the pairing and its reversal both belong to the modern system, dated to 1987.