And therefore, this light bulb allows us to visualize the movement of these electrons. As soon as it lights up, we know that electrons are traveling from this side to this side. Now let's look at hop cell number two. So this metal bar corresponds to our copper solid. And what happens is these two electrons combine with this copper ions down within the aqueous solution to form our copper solid. So in this solution, the copper ions move from in the solution to inside this metal bar.