For instance, they might think that roads depicted in red are actually red. They might also have difficulty with the scale of a map, perhaps thinking that a line can’t be a road because it’s “not fat enough for two cars to go on” or that a mountain depicted by a bump on a relief map isn’t really a mountain because “it’s not high enough” (Liben & Myers, 2007, p.202) Understanding the concept of scale of a map requires proportional reasoning–an ability that doesn’t fully emerge until adolescence-and so it’s hardly surprising that young children would be confused by it.