In order to obtain it, the player needs three ability points or above, or else they cannot unlock this ability. If the player still attempts to obtain it by clicking on it, the icon showing the upgrade will not light up.
This upgrade enables the player (Ori) to see secret areas as semi-transparent areas. However, the secret areas will not show on the map, even after Ori goes there. Still, if Ori has enabled the Life Marker, Energy Marker, or Ability Marker upgrades, they can see the Marker's location, even though there is no visible path there on the map.