With the hose, wash the edging with a gentle spray, dampening the sand between the bricks without dislodging it. As the sand absorbs water, it will set, acting like grout to lock the bricks in place for years to come.
The first project was to build a pebble mosaic carpet. This elaborate design took a month to lay out and set. I first arranged the entire mosaic in a bed of sand on site and then disassembled it and set it in mortar, using forms to break it up in to sections.