You simply use the zoom levels to give you what is effectively a page preview.

The game is played in a top-down view with various zoom levels.

Each tab also remembers its own zoom level.

At lower zoom levels, it allows the user to get information on pollution from particular facilities.

The Swiss cheese pattern was used for the closest zoom levels before high-resolution images became available.

At higher zoom levels depth contours are also displayed.

In less populated regions, the supported zoom levels might stop at around 18.

In Western cities, the supported zoom level generally stops at about 20.

The scenario map may be displayed alone at various zoom levels or, in this case, combined with multiple information displays.

Not to mention, if you change the zoom level by even 1%, the effect disappears.