“The Invisible Decrease” method - there are no holes or bumps in sight! Typically when you are decreasing, you are instructed to either single crochet 2 together (sc2tog) or single crochet decrease ([insert hook into next stitch, yarn over, pull up a loop] twice; yarn over and pull through all 3 loops on hook). The Invisible Decrease uses a different method, and it is very important to know the difference between the front loops and the back loops of stitches. When crocheting amigurumi, you usually work through both loops of the stitches. The front loops are those on the outside of the circle closest to you. The back loops are those on the inside of the circle.
If you are not already using “The Invisible Decrease” when making amigurumi, I HIGHLY recommend trying it out. Just like the Magic Circle, once you’ve started using it, you won’t ever go back!