Have you ever tried juggling? At first glance, it looks simple enough: throw a few balls in the air, catch them, and repeat. But what if I told you that there is an entire world of mathematics, physics, specialised equipment, research, and experimentation behind this seemingly simple hobby? I certainly didn't know much about it when I started, and what began as an attempt to learn a few tricks turned into an exploration of something much bigger than I had imagined.
Over the years and decades, I have tried my hand at quite a few things. If you have read my earlier posts, you would know that coding, sports, and a whole lot of other activities have been part of that journey. One thing I have noticed is that whenever I pick up a new hobby, I don't always stop at learning the basics. I end up going down a rabbit hole, watching tutorials, reading about techniques, understanding the equipment, and trying to figure out how to do things better. Sometimes, that exploration becomes as much fun as the activity itself!
Take tennis, for example. When I was learning to play, I would go through tutorials on the best way to serve, how to move around the court, and how to improve different aspects of my game, and then try to put those lessons into practice on the court every day. Cycling was another such experience. There was so much to learn about gear shifting, cadence, different gear sets and frame designs, and even which specifications were permitted in racing and which weren't. I genuinely enjoyed getting my hands dirty, setting up the ideal riding position, figuring out the mechanics of the bicycle, and establishing weekly cleaning and maintenance routines. It was a lot of fun exploring all these little details that you might otherwise overlook when you simply take up a sport.
Everything was going fine until I picked up juggling! I had watched a couple of juggling performances at IIT Mood Indigo, and something about them hooked me. I thought it would be one of those hobbies where you watch a few YouTube tutorials, practise a handful of skills, and gradually get better. There was probably some history behind it, I thought, but I never imagined the sheer amount of research, mathematics, experimentation, and technical knowledge that people were putting into it. I had barely scratched the surface, and the more I explored, the more interesting it became. Before going any further, though, a big shout-out to my brother for getting me some high-quality juggling props from the UK. Having the right equipment certainly made the experience more enjoyable!
Juggling also taught me something about how the eyes and body work together. You need a surprisingly good sense of peripheral vision, because you are constantly glancing at the balls, catching them, and throwing again without ever having time to follow any single object all the way. Or may be over time, juggling improves that peripheral awareness. Like most hobbies, it starts out very conscious: you think about every throw, where your hands are, and where the ball should go. With practice, those movements slowly sink in until they become second nature, and you no longer have to think about each individual throw. That is when you can finally focus on the pattern itself.
Let me share a few things that surprised me along the way.
Siteswaps: Yes, there is mathematics behind juggling
Did you know there is a way to write down juggling patterns and even check whether a sequence of throws is mathematically valid? It is called siteswap notation. Take the basic three-ball cascade, the pattern most people probably picture when they think of juggling. In siteswap, it is represented simply as 3, because each throw is followed by another throw of the same type. The number tells you how many beats later the ball will be thrown again. A beat here refers to one throwing opportunity, with the right and left hands alternating. So, a throw marked 3 will return to a throwing opportunity three beats later, allowing the pattern to continue.
Check out online animator here -- Siteswap animator
Now, what if you want to change things up? The sequence 5 1, for example, represents a three-ball shower pattern, where a higher throw is followed by a quick, low throw across to the other hand. The numbers are not just labels for tricks; they describe the timing and relative height of the throws. Once you understand the basics, you can start exploring different combinations and even use software to animate the patterns before trying them out yourself.
And this is where things get interesting. Not every sequence of numbers will produce a valid repeating juggling pattern. Siteswap notation gives you a way to analyse the sequence mathematically, checking whether objects will land at the right times without colliding. For example, 4 2 3 is a valid three-object pattern, while 4 3 2 is not a valid repeating pattern under standard siteswap rules. There is also a useful relationship between the average of the numbers in a repeating pattern and the number of objects being juggled. For 4 2 3, the average is three, which tells us that the pattern uses three objects.
Think about it for a moment: something that looks like a purely physical activity can be represented using a sequence of numbers, analysed mathematically, and visualised on a computer. I found that fascinating, and siteswaps are only one small part of the world of juggling.
Video -- Click to play
Russian juggling balls: It's not just about throwing and catching
Another interesting discovery was Russian juggling balls. Most beginners start with juggling balls that are designed to be relatively easy to catch and control, often weighing somewhere around 100 grams, although the actual weight and diameter vary depending on the type of ball. You might also come across beanbag-style balls, which are soft and deform slightly when caught, making them less likely to roll away when you drop them.
Russian balls are different in their construction. They are generally hollow shells partially filled with granular material, which changes their weight distribution and how they behave when thrown and caught. Depending on the design, they can feel quite different from traditional beanbags or solid juggling balls. It is another example of how even something as seemingly straightforward as choosing a ball can become a subject of experimentation.
There are also a few technical details you start noticing when you practise regularly, and they are a useful way to check your timing. If you find yourself moving forward to catch the balls, you are most likely releasing them too early. If the balls keep landing closer to your body, you are releasing them too late. Most of the power and height comes from your elbow and arm, so when a throw is too high or too low, adjust the elbow and arm movement first, rather than trying to move your hands faster to catch everything.
Juggling clubs: Height, spin, and getting everything right
Once you move from balls to clubs, things get more interesting, but the basics actually become simpler. As with balls, the height of your throw comes from your elbow and arm. Clubs also need spin, and that comes from your wrist. So you control two things separately: the height through your elbow, and the spin through your wrist.
This gives you a few options. You can throw a club low with a controlled spin, or throw it high with more spin, and as you practise you will learn both. The real skill is controlling the essential parts, the height, the spin, and the catch, so that every throw is good enough to repeat. Get one throw right after another, and you have a pattern.
What I particularly enjoyed was the way the learning works. You try something, observe what happens, make a small adjustment, and try again. Sometimes the problem is the height, sometimes the spin, and sometimes the timing. It is like running a series of small experiments, changing one thing at a time. If you enjoy understanding how things work, this can be just as rewarding as learning a new trick.
The people taking juggling to the next level
One of the things that surprised me most was discovering the people who were taking juggling beyond simply performing tricks. Niels Duinker was one of the jugglers whose YouTube tutorials I learnt from. His tutorials helped me understand the fundamentals and work on my skills, and it was interesting to discover his background as an engineer as well.
Then there is Jay Gilligan, a juggler and artist known for exploring juggling as a creative and experimental practice. His work goes beyond conventional tricks and performances, examining the objects, movements, and possibilities involved in juggling. This was another reminder that people approach juggling in very different ways. Some want to master the fundamentals, some want to perform, and others want to experiment with new techniques and challenge the boundaries of what is possible.
Youtube - Tech Talk by Jay Gilligan -- The evolution of juggling | Jay Gilligan | TEDxHelsinki
You also find people experimenting with different props, materials, sizes, shapes, and weights to understand how they affect the way a pattern is performed. The equipment is not merely something you buy and use; it can itself become part of the research and creative process. Watching or reading about such work makes you realise how much more there is to explore once you get beyond the basics.
And then there is the community around juggling, with international conventions, festivals, workshops, and competitions where jugglers meet, share ideas, learn from one another, and try out new things.
Back in the days when I was more actively pursuing this hobby, I would dream of attending one of these international juggling conventions myself! It would have been quite an experience to see so many people come together around something that most of us might otherwise regard as a fun party trick.
There is always more to explore
Looking back, I think that is what I enjoyed most about juggling. I started with the simple idea of learning to throw and catch a few balls, but along the way I discovered mathematical notation, the physics of throws, the differences between equipment, the importance of technique, and a community of people constantly experimenting with the art. I certainly did not become an expert, and there is plenty I never got around to exploring, but even scratching the surface was enough to appreciate how much depth there is behind the hobby.
It also reminded me of something I have experienced with many of the activities I have tried over the years. What you see on the surface is often only a small part of the story. Whether it is tennis, cycling, coding, or juggling, there is usually a whole world of knowledge and experimentation waiting for you once you start asking questions and looking a little deeper. You don't necessarily have to master everything or turn every hobby into a serious pursuit. Sometimes, simply discovering what lies beneath the surface is rewarding enough.
And who knows, perhaps I will get back to juggling more seriously someday, revisit some of those skills, and finally make it to an international juggling convention. Until then, there is always something new to learn, another pattern to try, or another rabbit hole to go down. After all, that is half the fun of experimenting with hobbies in the first place!
Finally -- below is another snap shot where I combine Juggling with Machine Learning (Object tracking) - combining two of my hobbies --
Video -- Click to play








