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You don't need superconductors to run into that problem.An ordinary magnet should be impossible for much the same reason.

This sun sparkling water looks like a quantization of sunlight,

This sun sparkling water looks like a quantization of sunlight, although each point should be much brighter than a single photon.

Different sun position.

"Point sparkles" obviously require a point source (or a rare event where the wavelets are all substantially concave) and the source must be behind the observer.Diffuse source, or source in front of the observer, produces diffuse reflections in most cases.

Compared with the angle subtended at the observer's eye by the ocean, it is a point

https://en.wikipedia.org/wiki/Subtended_angleIn geometry, an angle is subtended by an arc, line segment or any other section of a curve when its two rays pass through the endpoints of that arc, line segment or curve section. Conversely, the arc, line segment or curve section confined within the rays of an angle is regarded as the corresponding subtension of that angle. It is also sometimes said that an arc is intercepted or enclosed by that angle.The precise meaning varies with context. For example, one may speak of the angle subtended by an arc of a circle when the angle's vertex is the centre of the circle.

But somehow the sparkles seem like being quantized.

What do you mean? Is the angle close to zero?

Quote from: hamdani yusuf on 30/09/2023 04:07:09What do you mean? Is the angle close to zero?The diameter of the sun is about 700,000 km, at a distance of about 140,000,000 km so it subtends an angle of about 0.3 degrees at the observer's eye. At 2 m height, the ocean horizon is about 5,000 m so it subtends an angle of about 89 degrees. That is the difference between "almost a point" and "almost a plane".

You also need to consider the texture of the reflecting surface.

But these are not enough to explain the sparkling effect.

Quote from: hamdani yusuf on 03/10/2023 11:11:05But these are not enough to explain the sparkling effect.I think it perfectly explains the effect. Do you now realize that the sparkling is not quantized?