When seen from below by a predator, the animal's light helps to match its brightness and colour to the sea surface above. Counter-illumination is a method of active camouflage seen in marine animals such as firefly squid and midshipman fish, and in military prototypes, producing light to match their backgrounds. Marine animals of the mesopelagic (mid-water) zone tend to appear dark against the bright water surface when seen from below.
A landscape is usually made up of a hardscape and a softscape which means the trees, plants and grass. The use of boulders, tiles, sculptures, walkways or bird baths can be used to create a beautiful sitting area, a place for entertaining guests, or an outdoor cooking space.
The Different Kinds of Rocks in Landscaping. River rock can be used to simulate waterways in your landscape. When planning a landscape, your first priority may be plants, but rocks should also be part of your plan. Landscaping rocks provide focal points and add vertical features to an otherwise flat area. Rocks can also be functional by creating barriers, serving as mulch and helping with drainage. You can choose from one type of rock or add several kinds depending on your landscape needs.