I’m not even going to pretend to understand the disconnected aphorism in panel 3.
However, I admit that I like the way Rivera connected the ground line in panel 2 with the halfpipe curve in panel 3 to create some visual continuity. The continuous line is not a revolutionary device, itself, but a subtle way to reinforce Rusty’s viewing in panel 2 to what he sees in panel 3: So, we see the skateboarder through Rusty’s eyes. Except that, Rusty is in the background of panel 3. Rats! That theory is DOA.
And that’s why I wound up doing this blog instead of teaching art history classes.