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Following on from H's note, our mind hard wired to look for familiar patterns. That is why we see "horses" in cloud formations, alphanumeric figures in the lunar craters (the famous lunar "X" for one), and curious looking arrangements in stellar asterisms.
The Southern Cross is nothing more than a line of sight coincidence from our position in the Milky Way. And this is also only because of our Judao-Christian background. Other cultures that don't have the Christian cross as a cultural figure see this asterism representing another thing. Some Australian Aboriginal cultures see this collection of stars as a sting ray. No golden proportion here. Just a sting ray.
Nothing more than a coincidence of line of sight. Jump into a spacecraft and move in any direction several light years away from where we are now, and the "southern cross" asterism also ceases to exist as the component stars will be in a different arrangement as these stars are all different distances to us, so their apparition as an asterism will be altered in the three dimensions that we move in.
Alex.
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