I started to think of a memory from when I was very young - 4 or 5 years old - when I was playing on a beach with my brother at Talmine in northern Scotland and we lost our beachball that drifted into the sea. This was my first experience of "tides", I think, and I can remember finding the concept frightening.
I had to stop this though, as that memory has been revisited several times, in stories by my mother for instance; and I could not separate my memory of the event from recollections of others, and my own re-visions of the event inspired by them.
So I went back to the concept and thought about a particular aspect of a beachball: the small plastic/rubber valve that inflatable objects have. This reminded me of something: and here is where I got a really good memoring.
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When I was small, before I could swim, I used to go into the pool with an inflatable ring: it was dark navy blue on one side, and white on the other. I particularly remember the strange sensation of weight it had, and the equally strange hard and flapping quality the rubber had, when it was not inflated. Both of these qualities disappeared when it was blown up and turned into a light, sturdy, but smooth inflated object. As I think of it now, this object was very different to plastic inflatables made today: definitely not see-through; much thicker.
I also have a faint recollection of pride the first time I was allowed to inflate it myself, but this is tinged with a shame I felt because I couldn't manage to keep the air effectively in while I closed the valve; I didn't have the dexterity and envied those who did.