I went on a bit of a YouTube dive yesterday and found a performance or two of Raygun prior to the Olympics. I don't know much about breakdancing, but she seems legitimately talented.
https://www.youtube.com/watch?v=Kc1dlmWC76g
I like to recommend the episode(s) on John McAfee when people first start Bastards. They're wild and not nearly as dark/heavy as some episodes can be.
If you want to be able to trim off the ends, I suggest a double fisherman's instead (aka the double overhand stopper) with both strands (hold them together while you tie and treat them as a single strand).
https://www.animatedknots.com/double-overhand-stopper-knot
With either knot, after you trim, you can melt the ends of the elastic cord. It will "mushroom" a bit, which will also prevent the tips from creeping into the knot and coming loose.
A flat overhand bend in the elastic cord is what I recommend: https://www.animatedknots.com/flat-overhand-bend-knot
Justification:
Simple, not bulky, reasonably secure against shaking loose, and relatively easy to untie.
As suggested in another comment, a double figure eight could be used as well. It will be more bulky and a bit less likely to come loose.
I think we're saying the same thing?
You have your end grain slab laid on a table in front of you. From left to right divide cut it into parallel pieces (width of these is up to you 2" or 3" is probably fine). With them all laid on the table on their original pattern, rotate or flip alternating slices. Glue it up.
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