Have you ever seen a cubic bubble? With Zometools balls and struts and a little soapy water, a bubble cube is a cinch to make. A bubble cube can be made by making two identical squares, then connecting them with struts to make a cube. You might want to make a handle out of a longer strut so that you can hold the model without disturbing the bubble. Dip the model into a mixture of soap and water, trying to avoid the bubbles on the surface of the solution. There should be a small, squarish interface in the center of the Zome cube. If not, try gently shaking the model. Using a small straw, dip one end into the soapy solution, then touch that end to the interface in the middle of the cube. Gently blow into the straw. Some scientists use this cubic bubble within a cube as an example of the 4th dimension! If you want to learn more, Bubbleology 101 starts with the Crazy Bubbles Kit from Zometool. See the Zometool Models link to buy the Crazy Bubbles Kit.