>> ...all of which is true. However, a simple experiment with a wavetank 
>> quickly demonstrates that, for some reason that I don't comprehend, 
>> large waves won't go through small gaps, and yet small waves will. 
>> This is the precise opposite of what you would expect, but the results 
>> are clear.
> 
> Hum... I hate to admit this, but it seems you're right: I just hacked 
> together a POV-Ray script to simulate a wavetank-kind-of-apparatus (very 
> idealized, but still...), initially to disprove your statement - only to 
> find that indeed small gaps will not let low-frequency waves pass. 
> Changes in gradient will pass through - but not oscillations.

Weird, isn't it?

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