CanadaR

Using masks with Synfig does open up some fascinating possibilities.
In the first example below, I have imported an image from the Web, and a
text which I use as a mask to 'reveal' the image underneath. (Simple to do,
setting the blend method on the text to Alpha Over on top of a colored rectangle).
So where am I? Somewhere in Canada...

In the second example, I can do the same trick. And because the star is a vector
drawing from Synfig itself, there is an invert function that clouds the star but reveals the
image. Now you know where we are (Clue: somewhere in Banff National Park)