This pattern (from the collection of Niesz Vintage Fabric on Flickr) represents to me how the distinction between block and drop repeats isn’t really so cut-and-dried. Since both types are ultimately rectangular, they can be embedded in one another. Here, if the strawberries were all pointed in the same direction, this would be a half-drop, and the repeating would be the pink box. But since every other column of strawberries is reversed, the white box captures the entire repeating unit.
Clear as mud? Maybe it’ll make more sense next week as we tackle the half-drop.