What makes a home? Who builds houses and how? What tools do they use? How and what can young children build? What are the one million uses for the broken jewelry or odd shaped bits of plastic and metal from our Hector the Collector collection? How can we build a better world at school? With these pragmatic and heady questions in mind, we started our building study. As always, we started in our own backyard. "We're going on a walk, on a trail, to see a sleeping lion, a dog and a snail!" All children had a chance to walk around our neighborhood looking for homes. We all searched and were delighted to see the snail sculpture, a humble creature who carries its home on its back. We took note of architectural features like domes, columns, arches, and windows in all shapes and sizes. Our youngest children practiced walking together holding hands companionably in a mobile group. They took note of numbers on the houses and the letters on the street signs. We noticed the colors of the doors and we searched for birds nests and ant hills as we tromped along. The older children, ye of greater stamina and less wandering, went farther afield on their walk and even got to meet a construction crew and check out some of their tools and materials. Older groups also did field work at the Building Museum and dug deeper into work on patterns and architecture.
To explore concepts fully, children need to really touch them and, if possible, they need to bang and pound them too. So, under Tiffany's expert hand, we created a new area in school: Woodworking! Children spent several weeks learning the basics: how to find and put on their own safety gloves and glasses; how to hold and use the tools and how to put them away properly when done. Through working with wood and tools, children are steeped in all kinds of mathematical and scientific work. They learn to approximate and measure using their eyes and then rulers to gauge and understand distance, width and length.
We were also working at home too, honing our eyes as we searched and collected interesting odds and ends for our school Hector Collection. And collect we did. Your cleaned out drawers became our treasure trove as we dumped, classified, sorted and resorted, explored, played and otherwise swam in the wonder that is our Hector collection. Inspired by a Shel Silverstein poem about a boy, Hector the Collector, whose amazing treasures of broken clocks and keys with no locks is ignored by short sighted folks, we definately took the long look at ALG and nary a bit of ribbon nor tiny bead nor broken metal thingabob went unnappreciated.
Children went deep into the cognitive processes of sorting and classifying: of making and imposing sense and order onto a chaotic swirl. They recognize attributes and create patterns as they line up an arrangement of materials: all the yellows go here, all the circles go there. Then they are able to communicate their understanding to each other, "Hey that belongs here because..." Recognizing patterns and relationships is not just an essential math process but one that children will use across learning areas like literacy and science.
Children made the characters of the story using Hector materials and demonstrated their tremendous cognitive flexibility as bracelets became mouths and corks became legs.
We also made an awesome marble run from Hector Items and solved some serious engineering problems along the way. How many marbles do you think went to the floor before we came up with the idea of guardrails?
There was much engineering do be done and problems to be solved as we explored ways to make bridges. Using paper in different iterations (folded, crinkled, flat, etc.,) and also using materials such as fabric and wood, children hypothesized and then tested their predictions as they constructed a range of bridges. The plastic elephant was a good sport as he sometimes made it across and sometimes didn't. Children grappled with concepts such as weight, load bearing, structural support, balance and more as they built these bridges; all the while learning how to communicate these complicated ideas to each other and to listen to one another. 
The oldest children also did an intensive study of stained glass. All children were invited to walk outside and upstairs and explore some of the stained glass in our own school building and then represent that experience using contact and tissue paper. The oldest children engaged in a more intensive study.
We took repeated trips to study the stained glass windows and each time represented the experience through a different medium: we built stained glass with unit blocks and pattern blocks, we sketched it with pencil and drew with oil pastel. Finally we took several days to paint a stain glass window.
Other buildings, as you know, are best eaten and when we say children built with a variety of materials that includes graham crackers and fruit! Children learned about balance and pattern as they built houses out of crackers, patterns out of fruit and then again houses out of fruit and toothpicks. Children (and most living creatures) are sensory beings and the more that they can touch, smell and taste as they make their way through a complex world the better their understanding.
To really bring to life the idea of Building a Better World with friends, we gave the children many and repeated opportunities where they needed to work together as a team. From putting a tire in the sideyard that is too large for one child to lift alone, to team building projects, teamwork opportunities, both carefully rigged and spontaneously occurring, abounded daily. 
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One of our final projects was the amazing newspaper geodome. Children spent weeks carefully rolling up newspaper of different lengths. Then the rolls were compared and sorted by size. Finally, they were assembled into the dome (it was no small help to have an engineer co-op that day).
Our last few days of this study, children have been looking at pictures of themselves engaged in all the good work of the past few months and have been given chances to reflect and comment on their work. They have disassembled the geodome and most of the cardboard boxes as they help bring the study to a close. A good time was truly had by all, and we all did our best to build a better world, one person at a time.