Theme: While the theme of your map won’t adversely impact any services or facilities, it will affect the visual styling of buildings in residential and commercial zones, street markings, traffic lights, vehicle models, and other roadside props.Here’s what you need to know about all six map features and how they can impact your city: Before building your first city, it’s vital that you fully understand the map that you’re building on, as features, such as climate, outside connections, or natural resources, could ultimately have a significant impact on your city that you may not have initially planned for.