Blood Vortex

The Blood Vortex is an object mentioned by Carl in Llamas with Hats 11.

Llamas with Hats 11
Carl asks the Paul Mask if it remembers the blood vortex in Paris, saying that it was his favorite.

Llamas with Hats 12
The blood vortex appears above the Eifel Tower during the montage in the middle of the episode.