TikZ: Putting it all together

I have been working on TikZ a bit and finally got a result, which can be used for displaying time series:

Scaling one scope to another scope was key to succeeding with this. In the above image, the circles would be replaced by images of a timeseries, whereas the smaller squares show a more detailed view on the selected region of interest within this image. The only remaining challenge is a way of making the bounding box ignore the fake scope.

The code for above image can be found on github.