[quote=@DarkwolfX37]
<Snipped quote by Efficacy>

But what am I supposed to imagine?
[/quote]

Exactly what you just imagined! The world being different so that the field lines are different. You know in an intuitive manner why the field flows as it does. That intuition can be made as strong as any memory of sight or sound or smell or touch. You imagined, a little bit ago, how the "why" of the field could be different so that the field would flow differently. That's what you imagine, and that's what you overlay on reality.