While we perceive lightning from cloud to ground or cloud to cloud, the majority of lightning one sees occurs from ground to cloud.
Doesn’t lightning always work upside down?
Mother Nature can be scary at times until you realize that most visible lightning strikes work on the way back up. Electricity disperses out from the clouds in search of a return ground strike to meet.
Lightning is a fascinating optical illusion. PS: Visit lightningmaps.org to view a live map of lightning strikes around the world in real-time.