plasma membrane
"The fluid mosaic model is a good representation of the plasma membrane because the membrane itself is very fluid by being flexible and letting the membrane to complete endocytosis and exocytosis. The plasma membrane is like a mosaic because it is made up of many channel proteins, gycoproteins and cholesterol that all work together."
Extrinsic proteins in plasma membranes are like a flotilla of boats because they can move relative to one another but usually only in one plane, some may have masts / flags for signalling like glycoproteins / receptors, the proteins are held in relation to phospholipids like boats in the water.
Salt in the water has a role in stability /density of the sea as does cholesterol and the interactions between phospholipid tails in the membrane.
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