 Poul Larsen in 1962  proposed, that the intensity of the gravitropic reaction (bending rate) is proportional to

where α is the angle of reorientation, g - gravity vector and constants a and b are determined experimentally.Following the popular hypothesis of the mechanism of the plant spatial orientation, the bending from the horizontal position is caused by some small heavy particles that after turning put the pressure on the side cell (statocyte) wall, irritating some system and activating the bending process.The pressure of such particle to the cell was would be proportional to the sine of the reorientation angle, being maximal at 90° reorientation.