"Robbie and Kara Johnson are the husband and wife team behind Below the Boat, a company that creates gorgeous wood maps that show the hidden world underneath the water. Using the National Oceanic and Atmospheric Administration's (or NOAA) charts, they study the bathymetry (which is the underwater equivalent of topography) of lakes, rivers and oceans. Laser cutters are used to slice one sheet of birch plywood into 8 to 10 pieces. These are then layered until they bring out the contours of the seafloor. "Each layer is defined by lines of relief, we start cutting at sea-level and work our way down to the deepest point in each area," explains Robbie."