Highly fascinating! I'm a condition named after a mythical beast. Instead of a lion goat snake, this is when an embryo absorbs it's twin.

I am a wall you can see right through, A wooden web where the ivy grew. I cross my lines in an X and O, Giving the climbing vines room to grow.

One follows a camera’s click. Another warns that thunder is coming.

When shadows shrink and then grow long, The fire calls the drum, the song. I'm not the night, I'm not the day. I'm the turning point where light holds sway. Once a year I bring the crowd, To dance round flames and sing out loud. What am I?

Round and round they spin, looming towers of power. As long as there's a lick of breeze, you'll have electricity with ease!