Long-distance Shadows

This geometrical shadow pattern is cast by windows in a multistory building opposite us reflecting the setting sun through our kitchen window to the hall wall (the vertical line is an oblique corner in the hall). The windows are the ones reflecting the sun in this blip almost exactly three years ago, and here are very similar shadows cast two days later.  

I've added this to my tagged shadows series  (though I've had some trouble getting the whole thing up.