Mishnah * I.5.2. Ten vowels without standing alone, (continuing)
Their end is wedged into their beginning and their beginning into their end,
Their end - Simply speaking, this refers to the ten vowels in the previous part – the first part – of this mishnah. Earlier, I referred to the roundness of the mouth cavity and how each vowel sound is anchored differently from the others within the mouth. At the same time, vowels are loosely attached to each anchor so that they are each attached to another, too. See the third part of Mishnah 1 – "without standing alone."
A person can voice through the vowels by gradually changing the mouth's configuration until returning to the first configuration. An exercise like this begins when the mouth, tongue, and lips are most relaxed. Successive tightenings and adjustments form the anchors for successive vowels until sliding back into the most relaxed position. This is very much like following a path on a sphere to reach all regions while intending to return to where one started.
"The end – the last – of all these vowels is near the beginning," and this vocal exercise returns organically to the beginning.
Their end - The universal structure in creation only seems to be linear. What begins as potential leads to actualizing and then finally results in an outcome. The order of beginning, middle, and end are a seemingly linear structure that is consilient with the triad of potential, actualizing, and results.
Mishnah 5 teaches us that every end result creates the potential for a new cycle.
Mishnah I.5.2. [I.7] Chapter I, Mishnah 5 - The standard numbering of this mishnah in references is Mishnah 7. See the note for the first part of this mishnah.