What kind of shadow does the god with winged sandals cast?  Well, as you would expect, there seem to be two distinct Geminian shadows.  Some Geminis display both, and some only one.  The first we will call the Irresponsible Child syndrome.  The second we'll call the Plotter.  The first one we can illustrate with an actual dialogue which took place between a friend of mine and a Gemini at a party. 

GEMINI:  Anyway, let me tell you my views on how this country should be run.  First of all, I'm really opposed to the materialistic society.  I think people have got their values all mixed up.  All they're after is bigger houses and bigger cars and more furniture, and nobody cares at all what happens to his fellow man.  I think we should return to individual self-sufficiency. 
FRIEND:  By the way, what do you do?  (Noticing the expensively tailored shirt and the large solid gold ring.) 
GEMINI:  Who, me?  Look, I don't want to talk about me.  When people ask you that at a party, they're really saying, 'How much money do you make?'  We were talking about what's wrong with society.  If you really want to know, I do a bit of songwriting, and that sort of thing. 
FRIEND:  But how do you support yourself, since you're opposed to the conventional lifestyle of working an ordinary job? 
GEMINI:  Oh, I manage.  I just hate the sort of mentality that goes to work from nine to five, and takes out a mortgage, and gets all hung up with the bureaucracy of society's rules and values.  By the way, can you give me a cigarette? 

The punch line is that last question.  Our friend, shadow-Gemini, having waxed eloquent about what was wrong with the materialistic world, then genuinely expected my friend to generously give something which she herself had worked at one of those dreary nine-to-five jobs to pay for.  She refused.  Our shadow-Gemini was outraged, and immediately classified her as a selfish, materialistic philistine.  That's the Irresponsible Child:  like the god of thieves and liars, our Mercury-ruled shadow here wants to only have the divine twin, and dispense with the human one. 

The Plotter, in a sense, does the reverse.  He can't find his divine twin; so he feels terribly isolated and rather neurotic most of the time.  He can't connect with himself, so he feels disconnected.  You get this kind of typical scenario: 

NEW GIRLFRIEND TO GEMINI:  I don't know much about you.  Tell me about that place you come from - Penzance, was it? 
GEMINI:  Oh, you wouldn't know it, it's just a village.  Look, I must run out and get a morning newspaper.  (Later)
GIRLFRIEND:  You mentioned something about a contract.  Look, what is it that you actually do?  I'm really interested. 
GEMINI:  Oh, that, it was just a contract.  Do you think we can go see Nosferatu tonight?  I hear it's supposed to be really spectacular and I love Herzog's films. 
GIRLFRIEND:  (beginning to feel slightly uneasy)  But you didn't answer my question. 
GEMINI:  No. Quite right.  I didn't.  I'm just watching your reactions.  When I don't tell you something you get pale and