I've long admired the beautiful patterns with stacked stitches created by Xandy Peters - available on Ravelry or from her website "So I make stuff", e.g. the absolutely gorgeous Fow Paws pattern or Ribbon Candy. I really wanted to be able to do this technique and design something with it.
When I first tried the technique, it took me a while to get the hang of it - because, frankly, the stacked stitches all bungled up on the needles feel weird. But once I got over that (and got my maths right), stacked stitches have a certain rhythm to them and are really fun to knit.
The piece shown below is going to be a double-length cowl, knitted flat with the ends grafted together. (I like that construction :)
Videos explaining how to do stacked increases and stacked decreases can be found on the "So I make Stuff"-YouTube channel.