Blobs in a bottle? Say what? Are you referring to a lava lamp? That's the only connection that is obvious to me. If that IS what you refer to here, then here is an explanation. The "lava" is a type of compounded wax. When heated from below by the lamp bulb, it expands until it becomes less dense than the liquid above, causing it to rise. When it gets to the top, the wax cools and starts to sink again. The cycle repeats, making a convection current in the liquid. The importance to daily life is actually the phenomena so common in nature of convection. It is involved in the water cycle, in currents in the earth's mantle causing plate tectonics, in the currents in the oceans supporting, say, the Gulf Current conveyor belt, and in currents in the sun causing sun spots. It is in fact a very important phenomena for our daily life!