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What are the dimensions and materials of your shower?
I think you may have accidentally stumbled on a principle called Hemishperical Syncronization.
Everything in the known universe resonates at a set frequency, from elementary particles to skyscrapers to your body. There is a practice call psymatic medecine in which an ailing organ is exposed to it's distinct resonant frequency, allegedly promoting healing.
I believe what is happening in your shower is something like this.
Ever been walking across the floor at a bar or club and all of a sudden the bass gets really heavy around you, like being squeezed by the hand of God? The next step you take it goes away? These are called nodes and anti-nodes, created by standing waves.
A standing wave occours when the length of a room is equal to the length of a particular frequency's cycle period. Instead of the compression and rarefaction typically associated with waves moving through a fluid (air, in this case) the compression stage, or the high energy point of that wave is constantly occouring in the same places, 90 degrees into the cycle, every cycle. As the wave bounces back and forth, these high energy areas overlap, increasing the amplitude of the case frequency as a result.
If your shower was 3 feet across, it would associate to a frequency of roughly 191.7Hz (1/2 speed of sound divided by distance : 575/3= ~191.667Hz. If we divide that frequency into the four stages of a cycle (even, positive, even, negative pressure) we get ~47.92Hz, if we reduce the full cycle into octets (eighths) we get ~23.99Hz.
The human range of hearing clinically stops at 20Hz, but as we get older and stand in front of loud speakers, you lose more and more range.
There are four basic levels of awareness: beta (13 to 30 Hz), alpha (8 to 12 Hz), theta (5 to 7 Hz), and delta (1 to 4 Hz). The highest level is beta, and in this state the brain is active and very awake. This state is usually associated with intellectual thought and verbal expression. When you are talking up a storm, your brain is vibrating between 13 and 30 cycles per second.
The alpha level is the next state down, and it is associated with a much more relaxed, calm, and creative waking state. A nice alpha level can be achieved with a simple meditation of slowing your breathing. As your breathing slows, other body functions including your brain frequencies will begin to relax and slow down. When you are completely relaxed _ but not yet asleep _ your brain hums at around 8 to 12 Hz. 8 or 9 Hz is considered a very creative state, marked with contemplative thought and increased intuition.
Theta frequencies, are a very interesting set of frequencies. This 5 to 7 Hz range is where dreams, deep hypnosis, ESP, out-of-body projections, channeling, and other odd mind phenomena start to pop up. Somewhere in this range lies what is called the hypnagogic state _ that twilight-zone of consciousness on the border between being awake and being asleep. This is grey area where conscious and subconscious start to overlap. Most of us only get quick, half-remembered glimpses into this realm as we are going to sleep or waking up. However, with a researcher named Robert Monroe's techniques of brain entrainment, this theta state can be sonically induced _ allowing the entrainee to have extended periods of theta exploration.
The last level of brainwave activity is the delta range, and these frequencies are usually only associated with deep, dreamless sleep.
Without performing a spectral analysis of your shower and accounting for the reflective and absorptive properties, angles of reflection and diffusion and the change in humidity, and keeping in mind that the math above is just an example, I would assume that what's happening is that you are standing in either the axial, tangential or oblique node or anti-node of one of the thousands of frequencies produced by your shower and the lowest frequency in the harmonic scale of the node or anti-node lays somewhere in the 5 - 12 Hz range, inducing a shift towards alpha or theta awareness. Also consider that if you shower as soon as you wake up, your brain is probably in a rather malleable state as it is.
The phazer effect is just you altering the angle of attack of the frequencies you percieve, which is noticeable not just in your shower but in any small space. I should have explained the easy part first...
Hope that helps!
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