Nostalgia.

I wonder how many of you remember these Tupperware  building bricks from the 1970's, and how many have still got them?!
These are black and white for mono Monday, but in colour they are red, blue and yellow.
They were very educational, as on one side they have a letter of the alphabet, such as S, and on another side is something beginning with that letter. So S has a seal.   T has a train.
Also they open up, and can then be joined to make different shapes.
They are in one of my many boxes of toys. Waiting for the next generation!!

My blip for Mono Monday the theme being
Another brick in the wall.