The first wave you ever see

The first wave you ever ‘see’ is indubitably a light (electromagnetic) wave.

In this case, however your senses are not directly sensitive to the waviness, which resides in the variation (in time and space) of electric and magnetic fields. The animation depicts an electromagnetic wave emitted from an ‘origin’ point along some x-axis (both directions). The electric and magnetic fields are directed along the other two axes (y and z); they are perpendicular to the direction in which the wave travels.