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And the mechanism that's thought to be behind it is brilliantly simple. Cells in the root and shoot tips contain little packets of starch, called statoliths. The starch is dense so the statoliths always settle at the bottom of the cell. The position of the statoliths determines which direction auxin is released in. Tilting the plant on its side makes the statoliths roll and settle on the side of the cells, causing auxin to be released in that direction, and the cells there to elongate.
Phototropism (growing towards light) occurs because the tips of growing plant shoots contain a pigment that's sensitive to light, especially blue light. When light shines on the shoot, it gets absorbed by the pigment (called phototropin), and that triggers the release of the plant hormone auxin, which makes cells grow. The direction of the light determines where the auxin acts. If light is coming from the right, auxin gets sent down the left (shady) side of the shoot. That makes the cells on the shady side grow longer, putting a kink in the shoot so it points to the light.