Most importantly, there is a weird lack of context. As a child, you're the centre of the universe and every experience is intense and deeply remembered. One rock pool can keep you happily entertained for hours. It's warm - unless you've gone skiing. The weather smiles.
Evenings are balmy and days last for years.
I was lucky. Dad was a self-employed furniture manufacturer who built boats almost out of habit. Mum taught at a secondary school. We forgot what day it was and slept itchy with salt and sunburn. We hunted stingrays and strolled over the dry grass of Mercury Island to explore secret caves.