It's a really cool concept but it's quite difficult to get the hang of it.
- Is the lightning always landing inside the circles? If it is, why do some of the pillars cast their shadow inwards?
- Shouldn't the length of the shadow change as I move towards the lightning? So if I'm directly under the lightning, I should have no shadow.
- Shouldn't the length of the delay change as I move towards the lightning? So if I'm directly under the lightning, I would see a flash then hear the thunder straight away.
Maybe you didn't have time to put these in or maybe I'm misunderstanding :D