Mrs. C and I took Ellie to the Magic House yesterday, STL's excellent children's museum. There is a special exhibit called Towers of Tomorrow, with stunning models of some of the world's tallest buildings and towers made entirely of Legos. The structures were on a number of tables, each with a surrounding platform and a well full of thousands of bricks for visitors to use.
Ellie dove right in but the man next to us created an amazing structure. The slab rose higher and higher, steadied only be a small cross brace at the bottom. Several of us watched as it grew and wobbled, wondering when it would collapse. It didn't. Kenny, the builder, took it to a display table (top), staying together the whole time. It was quite amazing.