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by gjjrfcbugxbhf 3121 days ago
Ordering alignment of rectangular prisms under simple shear is well established by now.

As is the variable effects of shaking - can increase or decrease packing fraction and order depending on magnitude.

In addition ordering in packings of rectangular prisms extend up to 8 particle lengths from the side walls - and are variable with time and history. This experiment's results could be partly due to edge effects.