A small fiery particle thrown off from a fire

A small flash of light produced by a sudden disruptive electrical discharge through the air

A sense of liveliness and excitement

Any of those meanings will do nicely.

See the little dot of light in each eye?  We all have them.  Check out your friends and neighbours.  They all have the sudden glow that reaches out from their face to the world.

Or at least it’s designed to reach.  Some of us keep the dot to ourselves.  And that’s a waste of good light.

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Our eyes are meant to be noticed

We are meant to sparkle

We are meant to join

And many of us do