I think this is akin to the illusion of ring nebulae, which are more like bubbles than actual rings. Because they are a gas explosion, their 3D exterior edges l

I think this is akin to the illusion of ring nebulae, which are more like bubbles than actual rings. Because they are a gas explosion, their 3D exterior edges look thicker in 2D. So, if you are looking through a 3D cloudy sheet, it will look like a 2D “garden hose.”