Pattern blocks are so much fun! I saw these and remembered them from my childhood. I had wooden ones and these are plastic but I couldn't believe that I'd not thought about them in 20 years then they appeared!
I bought some for Hubs and she/ I have been having lots of fun.
The shapes are standard size and colour and all fit together. The green triangles, red trapeziums and blue diamonds fit together to make the yellow hexagons. The orange squares and tan skinny diamonds don't make the hexagons but the size fits with all the other pieces.