This little structure can is held up by it's own tension, provided by the rubber bands. The struts can be laser cut out of 1/8" acrylic or similar materials or 3D printed.
The concept of tensegrity is quite interesting, leading to the development of more complicated tensegrity structures called tensegrity robots. Tensegrity robotics is a field that Super-Releaser is quite interested in, especially our lead scientist Matt Borgatti, who designed this structure.
Print or laser cut all the struts and gather seven rubber bands (These ones should work well: https://amzn.com/B008X0A9DC). Attach one rubber band at the top hook of each strut and connect it to the bottom hook of the next strut. Then connect all of the struts together at the top and bottom with two more rubber bands.