Bauhaus-Universität Weimar

of rotation appears to bend forward also. When the 
head is at right angles to its former position, the person 
believes himself to be rotating around a horizontal axis. 
If the person in the box holds his head at right 
angles during the original rotation and raises it when 
the rotation is stopped, he feels himself to be rotating 
sidewise and upward. 
These and similar experiments show that angular 
accelerations in our rate of rotation depend upon the 
position of the head. The fundamental line of verti- 
cality is established by sensations from the trunk and 
limbs ; the axis of acceleration is dependent upon the 
head (anatomically upon the semicircular canals) ; the 
relation between the two is determined (when the 
eyes are closed) by those tactual and muscular sensa¬ 
tions by which we know the position of the head. 
The human planet is now to be revolved around its 
solar centre. He is seated upright at one metre from 
the axis A, with his face toward that axis. The closed 
box is set in revolution about A. The movement is 
perceived as long as it is an accelerated one ; as soon 
as it becomes constant, it is lost, and the person sup¬ 
poses himself to be at rest. The centrifugal movement, 
however, changes somewhat the bodily sensations that 
give us verticality, with the result that the body appears 
to be inclined slightly backward. As soon as the move¬ 
ment is stopped, the person feels himself return to the 
vertical. If the person is placed with his face at right 
angles during the experiment, he feels himself tipped 
outward. These and similar experiments show that a 
change produced in the bodily sensations by movement 
causes the sensation of verticality to change even though 
the axis of the body remains actually in the same 
In the previous experiment the person had, like the


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