Callouts allow you to do so much. You can create pointers, add text indications and also create comic-book style speech and thought balloons. Combine them with illustrations or photos of characters (both human or animal) and you will create something that will attract the attention of your audience. Among the 16 Callout shapes available in PowerPoint, all cannot be used for text and thought balloons — most of the time, you will use 4 of these options. While Rectangular Callout, Rounded Rectangular Callout, and Oval Callout shapes are speech balloons, the Cloud Callout is essentially a thought balloon.