What does flow feel like?

Could you please elaborate on the sensation of 'flow'? Could you describe the feeling in detail? I'm quite curious to know how it might feel to be completely immersed in an activity, where time seems to fly and your consciousness merges with the task at hand. Is it a euphoric experience? Or does it bring a sense of deep tranquility? How does it differ from our usual state of mind? I'm interested in understanding the nuances of this phenomenon and how it might impact our overall well-being.