Door in the window for an indoor/outdoor cat

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This cat and I were friends in Switzerland but only once in my two months there was I lucky enough to see her go up the cat ladder and into her humans' home.

Here she is jumping up to the first ledge.

Then up the ladder to her first-floor apartment.

And in she pushes through the ingenious cat door in the window! 
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(Linking to Camera Critters.)
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