Pumice stone field, Argentina

Hi Bob, a good point that I often make! Unfortunately, the white pumice blocks are actually just a giant, miles-long slab of pumice. They are eroded, so some of the less eroded "blocks" rise above the sand and look like singular rocks, but with others, like this one here, you can see it is part of this larger slab. The rock to the left and right of the block goes on for miles in either direction!!! So, I could isolate the blocky part of the slab, but I couldn't compose this particular image without having the trailing parts of the slab going to the edges of the frame. Here's an aerial shot that demonstrates what I was dealing with here, you can see how the parts that stick up are often part of a visible slab that just goes on and on and on . . .

But, you (and Richard) are correct, one of my strategies for working in this place is to try to find interesting pumice blocks that are surrounded by sand so that they appear to by isolated from the rest, like this photo:

That is a great bottom photo and thanks for the confirmation:-)