Slide from the video. Four gray boxes in a 2×2 arrangement. The two on the left are titled "Accusative". The top one has an arrow going from outside the box to the inside, and the bottom one has the arrow go through the box from the left to the right, starting and ending on the outside. The two on the right are titled "Dative". The top one has just a dot inside of the box, while the bottom one has a long meandering line that starts and stays inside of the box. In the top left corner of the slide is a reference: "see also description in Langacker (1999): 56-57"