shoe / caligae stress analysis

[richsc]

Let me suggest that the caligae, and maybe all shoes, have six parts for the purposes of fitting/function, per below.

ball, arch, heel, back, ankle and sole.
The ball and arch anchor the foot to the sole to prevent too much forward/backward movement, which is how the lacing should be done to support this:
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It looks to me that the heel strap prevents lateral movement, rather than backward movement.


It appears that the back strap pulls through the ankle straps to the ball to bring the heel up.

Anyway, these are suggestions; thoughts?