Mono Monday . . . Rhymes with Luck . . . Truck

I have kept one box of good quality baby toys.  This is a brightly painted wooden truck which carries a load of wooden blocks.  I got down on the carpet and had a little play.  What is it about a toy with wheels and blocks that can be stacked?  Now I took this photo because I couldn't be bothered going out to blip a duck or a real truck.  It is another day of strong wind gusts.
Thanks Laurie for being host this month.