Mar 13th, 2018
“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.” Terry Pratchett came up with the idea of slower light in his Discworld books - the magic that surrounds the flat planet causes the speed of light to decrease. As such, a sunrise creeps across the world like liquid.
I've always enjoyed this imagery, even if it raises a million questions about how anything would work on Discworld. You have to give up and realize that it's magic, and there's no point dissecting it.