In subsequent versions, the top tube has stayed, but much else has changed.

WSJ: Sjoerd Smit of Vanmoof: A Designer Spin on the Grandma Bike

The top tube also has lights built right into it.

WSJ: Sjoerd Smit of Vanmoof: A Designer Spin on the Grandma Bike

On top of the mess, one straight tube juts out, a square of gray duct tape hanging from it, flapping in the breeze, a flag of surrender.

NPR: L.A. Looks to Cut Smog with Leaf Blower Trade-In

We all remember the thermostat poster and watching as the color filled in the tube all the way to the top.

FORBES: Connect

Nevada Solar One uses a parabolic trough design, in which curved mirrors, 16 feet from top to bottom, concentrate the sun's rays onto a glass tube with a steel bar at its center.

FORBES: Light And Heat

In that procedure, doctors put a silicone tube, which is like a big rubber band, around the top of your stomach, restricting the amount of food you can take in.

CNN: Congrats Gov. Christie: You saved your life

Though the tubing laid on top of the trees during the test run, more permanent pipelines can be installed by laying a tube along roads or rivers, digging a trench, and burying it.

FORBES: Startup Aims To Install Pipelines With Helicopters...Seriously!