The interplay of illumination and umbra has captivated the human imagination since time immemorial. From the celestial dance of stars against the cosmic void to the intimate glow of a candle flame illuminating a https://www.youtube.com/watch?v=kEikSRjXzZ4&list=PLZyUCudMkqcM4mk4_dH3OwD3Vix21ySC0&index=2&pp=iAQB0gcJCQMKAYcqIYzv