iDIDJ Australia Didgeridoo Cultural Hub

Hi all,

Something came to my mind after having watched this awesome video :


The trick there uses the "moiré" effect.
The fish are drawn of the floor as several images interlaced in a linear-grid pattern.
The table on top has got the same linear-grid pattern and allows the spectator to altern the visibility of the patterned-fish, hence generating the illusion of movement.
This is a very brilliant creation using the amazing properties of the moiré effect.

Doesn't this criss-crossing remind you of something ?
Rarrk !
The Rarrk pattern generates visual illusions in the same way, giving this sparkling effect to the painted barks.
A bit like when a guy with a striped shirt appears all flashy on TV > link
Observation and contemplation of this complex effect sure puts you quickly in an alternate state of mind !

Moiré effect can be a visual effect, but also any kind of effect implying the superposition of two patterns.
Sound is "patterned" in waves/frequencies... and music itself is patterned in rhythm.
Could this ring a bell as far as traditional Didgeridoo playing is concerned ?
In both NEAL and WAL styles of playing, there is a (nearly) constant "Passive Voicing" that has the particularity to "growls".
That typical "growling" sound is obtained by a "sonic-moiré" : a certain pitch for the voice suits a certain key of didj. (12th or 9th or 5th)
Superposition of two patterns : the frequencies of the pitches of the voice and the didj.

Could this moiré effect also be used on a broader time scale : in the song's rhythm itself ?
Mingling Songman, Bilma & Yidaki patterns ?... mmh maybe that's too far-fetched...

Anyway, just to share a thought

"Far-fetched" you ask? I don't think so at all. Sometimes great discoveries arise out of ideas that seem far-fetched. It makes sense to me because sound waves have many similarities to light waves...sound waves are just a lot lower in frequency. AFAIK, no one has done a study on this particular topic....maybe you could be the first to make a new discovery.

This is very very interesting... I have to go through this several times to understand what's going on

G

Aha... its an optical illusion, the movement of the viewer is what creates the effect!

With regards to sound, and didgeridoo in particular, check out this video I just uploaded - quite a coincidence as I uploaded it just before I read this post:

http://www.youtube.com/watch?v=VmJMjJwIvuY

This is Elijah playing yirdaki, notice the nasal and throat effects? It is more pronounced than other Yolngu players, and quite beautiful actually in terms of rhythm. I haven't quite gotten Elijah interested in online things yet though many of his family are, I wish I could get him on here to discuss stuff coz he's pretty clued on and has a good grasp of English. I've gotten a lot of families onto Facebook as an aside, they're abandoning a Yolngu-dominated chat site that we get onto through mobile phones so if people want to learn and interact directly get onto Facebook.

Thanks for sharing Francis, keep those interesting posts coming!

Guan

Interesting!!!

Paul