Nice picture of a Marbled Orbweaver I spotted in the backyard yesterday. It is convenient for measuring purposes how the spider is resting on a grid. I measured the width of the square to be 2.67 mm. One interesting observation is how each of the spider's legs are attached to the thread that makes up the grid. The tarp itself is probably too slippery for the spider to grip, but the edges made by the small thread seem to work just fine.