article The frieze tree Patterns that repeat in a line are strangely interesting. How many types are there and how do you tell one type from another?
article Frieze patterns in cast iron A gallery of beautiful photos of cast ironwork friezes in Australia with a mathematical discussion of the classification of frieze patterns.
game Favourite Transformation game Age 11 to 14 Challenge level Why not challenge a friend to play this transformation game?
game Penta play Age 7 to 11 Challenge level A shape and space game for 2, 3 or 4 players. Be the last person to be able to place a pentomino piece on the playing board.
problem Robotic rotations Age 11 to 16 Challenge level How did the the rotation robot make these patterns?