The artist is talking to the cyclist.
...
Cyclist: Can I use the bicycle?
Artist: Wait a moment. I’m trying to see what happens when you turn the handlebars to the right.
Cyclist: The bicycle turns to the right?
Artist: I want to see what happens to the wheel. See? It turns elliptical. And the right handlebar goes up and the left handlebar comes up.
Cyclist: It doesn’t feel like that when you’re riding it.
________
Voiceover
Sometimes a mundane shopping excursion intrudes on the creation of great art. Attempts at humor by the would-be cyclist are lost in the pursuit of an elliptical bicycle wheel.