I built some cool shelves this week. Thanks to Mathhias Wandel at Woodgears for the design and inspiration.
I like the design because it makes use of a cantilever bracket that seems to give the shelves an air of lightness while belying their real strength. The shelves ( made from 3/4" plywood) are attached to the supporting wood. Attaching them in this way stiffens the shelves and distributes the weight of the load across the brackets more efficiently than if the plywood was simply laid across the brackets.
I suspended the shelves from the floor joists using simple carriage bolts. The whole thing is hanging from the joists. If we wanted to, we could easily swing the unit up out of the way for... I have no idea why.
The shelves are remarkably strong. I (183 lbs) can hang from them with no sagging. Of the shelves. I still sag.