Is it normal i can make bright lights shadow by squinting?

I don't really know how to explain this, because it varies a lot. But mostly, it looks like slightly less intense versions of the light appearing below & above it (at the same angle, so they're in a straight line), with a straight streak of light going between them and the light itself. Streaks might extend beyond the shadow itself, like someone applied motion blur. Usually, the bottom one is stronger, and they sometimes might get offset compared to each other. more 'sparkly' lights may get thin 'rays' of light, and other shit happens, but that's not the point.

The point is, by moving the muscles around my eyes and changing the angle of my head, I can control the size and angle of these shadows - typically, squinting more will make them stretch further away from each other, and the angle, and if one shadow shifts more than the other, depends on the position of my head. I can probably do other shit by moving one eye more than another, etc, but I never thought to really investigate.

I tend to notice it more in the mornings, because I'm half-conscious and there's a bunch of sunlight shining into my window (I often end up playing with it without thinking about it), but with some effort I can cause this to happen at any time (given there's a light). I can also make clearer double images more rarely, but I can't go cross-eyed on command so I don't know if it's like that or not.

I tend to also see afterimages, faint static over my vision (moreso when tired or on flat surfaces), tiny moving dots in the sky, etc. None of this has ever interfered with my vision or made me unable to see anything I wanted to unless I was exceedingly tired, and I otherwise have 20/20 vision.

Also, doing it a whole bunch to write this out sort of made my ears hurt, so there's that.