Along with the solid panels, Pythagoras has openwork sets like this one. The pieces look light and hollow, but their connection principle is exactly the same. We made each cube from these polygons, and then a whole Pythagoras city.

Pythagoras, Tiko, and Tako are vintage building sets. They have big panels of different colors and shapes, that connect by the edges. Each piece has sockets and balls that can snap together, connecting the pieces. You can also connect the pieces of different shapes, as long as their sides match. This connection is strong enough to hold even the biggest structures together.

Because of the sockets’ form, Pythagoras and Tiko panels can form both flat surfaces and 3D shapes. The flexible joint connection means that you can connect the pieces at different angles. The bigger panels are huge – they are a few inches long, so kids can create toy hats or items to hold, and not just toys. They are sturdy enough to wear and to play with. There also are smaller pieces that can help connect the bigger pannels together or make smaller crafts. The pieces of this set have all kinds of shapes – there are different triangles, rectangles, squares, pentagons, and so on, all in different colors.

Sadly, Amazon seemingly has no sets exactly like Tiko and Pythagoras, but some very similar concepts also are interesting enough.