Seven weights, each the double of the one before. Seven tones for each of the major and minor scales: respectively, do re mi fa so la ti and la ti do re mi fa so – and indeed any of the other heptatonic scales (dorian, mixolydian, ect.). And let’s not forget the seven days of the week.
Precision down to a quarter of an ounce, ‘¼ oz’ tiniest weight, which perhaps explains why sachets of instant yeast come in seven-gram packs, = approximately one ounce.
If you’re old enough to remember being taught imperial measurement at school, do you think it was helpful in understanding and improving maths skills? Do you have any other thoughts on the mysticism of numbers, in particular the number seven? Could it have something to do with the origin of the expression seventh heaven? Let me know in the comments.
Alison Chabloz 
Hi, Alison. I think that “7th heaven” comes from Islam.
Yes… https://en.wikipedia.org/wiki/Seven_Heavens Seven Heavens – Wikipedia Mesopotamian religion. The concept of seven heavens as developed in ancient Mesopotamia symbolised both physical and metaphysical concepts. In the Sumerian language, the words for heavens (or sky) and earth are An and Ki. The ancient Mesopotamians regarded the sky as a series of domes (usually three, but sometimes seven) covering the flat earth.: 180 Each dome was made of a different kind of … en.wikipedia.org
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Thanks, Ian, very interesting. Twelve is another – 12 notes of the chromatic scale, 12 months of the year, 12 signes of the Zodiac, 12 old pennies to a shilling.
Now I have an idea for an upcoming new post. Thanks also, by the way, for your support and the updates published on your own blog when I was unavailable. Courage and integrity seem somewhat lacking when it comes to other nationalist voices in the UK, so I am very grateful.
Alison:
Thank you. Always welcome.