Until i find the origninal html page for these sand spikes i'll just point you to the images
Such as this one
This is an old image from my cheepo first digital camera bought for this find. I'll have much better ones now that this new development has emerged and i've got better cameras and 3D capability..
If you are not equipped with 3D viewing capability, i've got inexpensive side-by-side viewers or you can get them on line at this link.