The comes the cutting and gluing. Lots of cutting and gluing. My estimation is that this piece contains about 600 individually cut pieces of glass. That is a lot of tiny pieces of glass.
Here is a closeup of the barn. It contains 71 pieces of glass in case you were counting.
And here is a closeup of the horse.
And here is the final piece. I used white grout in the original. For the remake, I used gray grout. It is a little more neutral and lets the colors speak for themselves.
And here is the piece from the side. As has become my technique, I wrapped the tile around the sides of the frame.