Big Tinkertoys

I saw these in the city a week or so ago. Really interesting objects. It was immediately obvious how these things worked. First, they are construction barriers, and they don't weigh that much sitting here, given that they are just plastic. I found some others connected together further up the street. There are big white pins that go down through the holes, joining the pieces. Now the cool thing is, once everything is connected, the "tinker toys" are filled with water! NOW, they are heavy! How much easier than dragging solid concrete barriers around. But I couldn't get over that these things do look like toys, don't they? And I love the brilliant orange color.