Of course, you don’t believe in all the new age stuff with vibrations and all, don’t you ?

So, let’s introduce you to the visible part of it:

Exhibit #1: water and sound experiment:

https://www.youtube.com/watch?v=uENITui5_jU

What is nice, is that you can build it yourself (almost easily):
 a speaker
 a water hose connected to a water supply
 tone generating equipment
 a 24 frames-per-second camera

Exhibit #2: the resonance experiment

This one starts with a quote from Nikola Tesla:

If you want to find the secrets of the universe, think in terms of energy, frequency and vibration.

and is a very visually beautiful experiment:

https://www.youtube.com/watch?v=wvJAgrUBF4w

I would like to give credit to friend PHA who has pointed me into the direction of Douglas Hofstadter’s book Metamagical Themas.