There is no logical reason to avoid the water if you are a merperson. It would be beneficial to your health. [ Touch water, Sonic! ]
Those things you suggest would require me to be at a scale with which I could interact with them. But perhaps I can imagine the objects in my mind, and what it would be like to solve them.
<galagamer>
Those things you suggest would require me to be at a scale with which I could interact with them. But perhaps I can imagine the objects in my mind, and what it would be like to solve them.