I seen a lot of booth gadgets in my time but this is about the coolest one that I've seen in years. This was in use at the Arbor Networks booth. Basically, the gizmo released a very cold stream of gas that caused the air to condense around it as it "poured" towards the floor. It almost looked like a waterfall - a "fogfall". Then they used a project to project images and text onto the fog as you see in the photo above.
No matter how many times I entered the exhibit floor I always wanted to walk by and see the effect...
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