the test boat was done in black to reduce glare and give the boat a handsome accent, and the shade even includes clear overhead window sections in case you want a little more light. we don’t really know what’s going on in the background. keep in mind the objective right here – it's not on the market (at the least not but). if you are active, drink more water to account for water lost through sweat. other cross-sections will tend to show blobs and it is not so obvious that they are the result of smearing along ray bundles. 