All we know about the universe is wave interference. These waves exist because there’s something for them to bounce off of. This is where our senses come in. All of our senses are various chasms for detecting the various echoes around us. Sound being the most obvious form of echo, but our eyes, nose, mouth, and pores are all forms of caverns that have evolved purely for the sake of measuring echoes. Things that relate to the patterns these echoes create seem sacred to us. Just like we find a strange peace in looking at fractals, we seek out aesthetically pleasing forms of wave interference such as mandalas, cymatics, sacred geometry, etc.