I would like to combine 2 graphics with different plotranges, but the plotranges for each graphic shoudnt change.
As an example:
 
Show[{
  Graphics[{Yellow, Rectangle[{-1, -1}, {1, 1}]}, 
   PlotRange -> {{-1, 1}, {-1, 1}}],
  Graphics[{Thick, Circle[{0, 0}, 0.9]}, PlotRange -> {{0, 1}, {0, 1}}]
  }]
What I need is this: 
What I get is this: 
I didnt found a simple solution for this. It would be great if someone could help me :)