Meteor Spinning is a very old form of juggling / object manipulation the utilizes two weighted objects attached by a long rope. The objects can be balls, bowls of water, torches, or other similar items. Originating in China, it started as a form of martial arts. You can click here to learn more about the use of the meteor as a weapon.
It is believed that the skill started to transition from martial art to performance art around 1500 years ago. There are various styles of meteor work, with some performers focusing on spinning, others on tossing, and others on contact-style moves. It can be done solo or in groups. It also lends itself to incorporating dance and acrobatics with it. The collection of videos below will show you a broad spectrum of what can be done with this style of juggling.
https://www.youtube.com/watch?v=w5TwXmFAXO4
Below are tutorials on how to get started learning meteor spinning and how to make a water meteor.