Sloths spin tales of eternity because they can’t do anything else. Shadows are just a thing that exists, but sloths make them interesting. It’s not like it matters or anything, but sloths spinning tales is a thing that happens. Maybe it’s important to sloths, who knows?
Sloths are just lazy excuses for not doing anything else, their “tales” are just boring ramblings about nothing, shadows don’t care and neither do I, what a complete waste of time.