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spiral secondary ?



Just a strange thought that floated through my mind the other day -
would a flat (or angled) spiral *secondary* be practical ? I'm sure
the change in inductance per turn would have some effect - maybe good,
maybe bad?
Maybe too many volts per turn to insulate  on the outer turns? What
shape should the primary be?  
Shouldn't be too impossible to wind  a flat one - plastic insulated
wire would be fairly easy, magnet wire would be a bit trickier, but
should be possible using a plastic sheet covered with double-sided
sticky film, so it sticks down as you wind it. 
Any takers? 
Feel free to shoot it down in flames....!