How do you support a 350 pound slab of marble?

Very gracefully and with steel of course...

I just delivered this large table base for a client. The table top is marble and is 48" x 116".

Stone slabs like this don't like to lay flat despite the fact that we use it like this all the time. When a slab is vertical on edge it is less susceptible to fracturing. When a slab is horizontal it must be supported throughout especially on the overhang so it doesn't break. The challenge is to do it with the least amount of material possible so as not to distract from the design. Remember: less is more.

I also fabricated the chairs. The upholster did a great job of wrapping the seats we provided.

(click on the image and see the images of before and after)