Wave Phenomena:

The universe is drenched with ripples. Waves can take place in any mode and medium we care to visualize. The waves propagate in liquids, gases, and solids. The waves ripple throughout the space-time continuum and through what emerges to be the nonexistence of any medium at all. Consider

1.  The air throughout a musical concert.
2.  The surface of a pond subsequent to a pebble falls in.
3.  The surface of a lake on a breezy day.
4.  The surface of the ocean off Maverick's Beach in the California.
5.  The tops of the stalk in the wheat field.
6.  The surface of a soap bubble whenever you blow on it.
7.  High clouds close the jet stream.
8.  The Earth's surface all through a major quake.
9.  The Earth's inner side after a major quake.
10.  The human brain at any time interval.
11.  A guitar string subsequent to it has been pluck.
12.  The utility power line moving alternating current.
13.  The radio or television broadcasting antenna.
14.  An optical fiber transporting a laser beam.
15.  The electromagnetic field within a microwave oven.
16.  The Space-time close to a coalescing binary neutron star

Some wave phenomena are simpler to comprehend than others. When a wave is simple to see in the mind's eye, it is not essentially general in nature. When it is difficult to visualize, it is not essentially rare.