Our eyes and pineal glands are specialized organs that accentuate every cell's sensitivity to electromagnetic frequencies... 

Modern lighting technologies like LEDs and fluorescent bulbs are engineered to make only selected frequencies of light rather than a broad spectrum, so our indoor environments have become depleted of most frequencies.
 
At the same time, we have flooded our bodies with repetitive frequencies of EMF from information age technologies. In the past decade alone this stress source has increased over a quadrillion fold. 
 
Sound frequencies are important, too. With light, while we are in our bio-body suits in this life, we see frequencies filtered through cells receptive to red, green and blue light, so we see blends of colors rather than seeing the frequencies directly, as we do in an out-of-body experience or in the afterlife. But we hear sound frequencies quite distinctly. The difference in sound harmonics makes the difference between music and noise. That is a good analogy to the difference between the beauty of natural EMF like a sunrise or the Earth's Schumann field when we're walking on the beach versus the Electromagnetic Pollution of cell phones, bluetooth, Wi-Fi, and 5G. Because of body's connective tissues are piezoelectric, every EM frequency becomes either music or noise to every cell, and every sound also becomes an EM frequency...