IS THIS A STUPID IDEA? So many Possibilities and Infinitely adjustable!

I came up with this Idea the other day and made a few just to try it out! Is it stupid if it works? It’s easy to store, and very adjustable. Just change the length of the square tubing. This Joint could be used for a Shelving system, Fireplaces, Tent framing, Or a Sawhorse. Any other Ideas?
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