Marudai is a flat board with four legs that looks like a mini table. People use it to make something called Kumihimo, which is a way of weaving cords together to make things like bracelets and necklaces.
On top of the marudai, there is a round disc called a tama. The tama holds the strands of string that will be woven together. People move the tama around the marudai in a specific pattern to create different designs in their Kumihimo.
Using a marudai to make Kumihimo can be very relaxing and fun. Plus, it's a great way to create personalized jewelry for yourself or as a gift for someone else.