Techno-smear
(Extracted from http://wiki.mindcloud.org/wiki/Techno-smear ;-D)
Next exhibit: Planet Earth. Here we have a small planet with an infinitesimally thin smearing of technological organisms on its surface.
A kind-of determinist outlook might take away from 'the purpose of our existence' - but gives us the apparent freedom to decide what purpose we should or could follow, just for kicks.
For me the most fun adventure would be to see if this mechanically insignificant coating of humans can spanner up the works of the entire universe! 'You call that entropy?' we'd say, and bring the joys of an early heat death to the cosmos, swinging ropes of evaporating black holes above our heads as we scream towards the end of time itself.