Imagine you have a circle, and you want to spin it around really fast, but instead of spinning it in a normal way, you decide to spin it in a way that doesn't make any sense. This is called an "irrational rotation."
To understand what this means, you first have to know what "rational" means. Rational numbers are numbers that can be written as a fraction, like 3/4 or 2/5. They can be easily expressed as a ratio of two numbers.
Now, an irrational number is a number that can't be written as a fraction, like pi or the square root of 2. These numbers can't be expressed as a ratio of two numbers, which means they're a bit harder to work with.
In an irrational rotation, the circle is being spun around by an irrational number of degrees, which means there's no way to express how much it's being spun in a simple way. This can make it really difficult to predict where things on the circle will end up after it's been spun around a few times.
But even though it might be hard to figure out what an irrational rotation will look like, it can create really interesting and unpredictable patterns. It's like trying to draw a picture while shaking a pen really fast - you never quite know what you're going to end up with, but it's sure to be unique and different every time.