If one lowers a grid of obstacles into the water, with the spacing between the obstacles roughly corresponding to the wavelength of the water waves, one will see diffraction from the grid. At certain angles between the grid and the oncoming waves, the waves will appear to reflect off the grid; at other angles, the waves will pass through. Similarly, if the frequency (wavelength) of the waves is altered, the waves will also alternately pass through or be reflected, depending on the precise relationship between spacing, orientation and wavelength.