Hi all, this is my first post. It seems around eight years ago I was on a similar brain-wave-length as Laurence Kemball-Cook, with his idea to create a power generating flooring surface... only he had the know-how to bring the idea to market, so credit where credit is due. (though now I wonder couldn't the insides of shoes simply have this and save on the manufacture of area that may never get stepped on? Or maybe that's been done already too) Anyway, on to the next idea I don't have the know how to bring to market, but I'm curious to learn about the feasibility of the idea in terms of forces involved... it's based on an idea I had watching the footage of ice going down in low-tide and being lifted in high-tide in this clip from BBC Human Planet: (around the 1:10 minute mark is where the ice goes down). What immense power is demonstrated there, in lifting such heavy ice! I can't help but wonder if the two ideas for energy conversion were to be married: That of buoyancy and that of weight pressing down.... could the up-down motion, buoyancy and weight of an object lifted and let down by tides, be part of an equation that allows us to convert that energy into something we can use? I'm NOT talking about a PMM or Free Energy because nothing is free and nothing is perpetual I understand very well. I've seen tidal power plant concepts but nothing that utilizes an up-down motion, with a buoyant but heavy object when it's being pulled up, or the weight of the same object when it's released down, to generate electricity. Am I way out there with such a marrying of ideas? What forces are involved (that aren't immediately apparent i.e. Gravity & buoyancy... or I haven't already mentioned) and what mechanisms/engineering principles would I need to get schooled in, in order to learn more about the principles involved? And it also makes me think of the up down motions of elevators... I wonder if there are any elevators that are geared towards self-charging when it's the case that the elevator is going down? Like a hybrid car that is half electric and half self-charging? Thanks in advance for any kind and patient input you could give or directions you could point me in.