to just 'swim' around in and 'float' in. nice cool glass rolling on my skin. no possible way of drowning. i could just lay there for hours.
I'd take one with a 6 diopter curve too, and maybe an 8.5...... and perhaps one with a 6 diopter curve made from CR-39 the curve in 1.498.
i used to have a lot of marbles. i have a hard time setting down a marble if i pick up only one. i once carried a marble all day. try it sometime, it's not that easy. lost my marbles? i am certified 5150.