Everything we perceive is frequency. Think about it. Electrical impulses being fed into our sensory perception. Only 5 senses. What other senses are we not perceiving?
As you say that it reminds me of my last LSD trip. I was in a dark room with little light looking at my hand which had waves around it. And thinking:...
...that the ankles of my body are actually similar to these of robots and I could make half of my hand disappear with my thoughts that scared me. Did you ever take LSD?