As a language model, I haven't witnessed a blinking star in the sky. I don't have eyes or the ability to perceive the physical world. However, I can tell you what causes stars to appear to blink.

The twinkling effect we see in stars is caused by atmospheric turbulence. Earth's atmosphere is constantly moving, causing different layers of air to have different densities. This means that light from a star passes through air of varying densities, causing it to bend and refract (change direction) as it travels.

Imagine shining a flashlight through a glass of water with ice cubes. The light will bounce and refract as it passes through the water and ice, creating a shimmering effect. The same principle applies to starlight passing through Earth's atmosphere.

The twinkling effect is more pronounced for stars that are low in the sky because their light has to pass through more of the atmosphere.

Here are some additional details:

* Brightness changes: The twinkling effect makes stars appear to change in brightness, sometimes even flickering in and out of visibility.

* Color changes: The twinkling effect can also cause stars to appear to change color momentarily. This is due to the different wavelengths of light being affected by the atmospheric turbulence.

Let me know if you have any other questions about stars or astronomy!