It took me months to save up enough lids for an impressive lid bin. When I introduced it to the children we were all sitting in our kitchen area enjoying our lunches. I brought out the lids which I placed in a sturdy shallow wicker and wire basket. I held the basket/bin under the table and shook it. I asked the children if they could guess what I had. I did this so long ago I forgot what their guesses were. I placed the bin on top of the table and the children were very excited. Who knew? We talked about the shape of the lids, the various colors and how some of the lids had words on them. I told the children the bin would be in our block area if they would like to investigate and immediately upon finishing lunch they swooped down on it. There was stacking and sorting, nesting and counting, design making and patterning. There was a single purple lid that allowed one of the kiddos to complete a "beautiful lid rainbow". All the busyness and exuberance makes my heart go thumpity-thump. The children enjoy working with the bin and are extra delighted when they find a cap in their lunch or snack bag. Now we have more than one purple lid for more rainbow making. This is preschool math at its best.