Assertion: tetrahedron | /r/CapableOf | turn sixty degrees
Facets:
value: upside down
type: MANNER
Source sentences:
text: Another construction of the cross polychoron is to consider it as consisting of a tetrahedron in our space, a tetrahedron turned upside down and rotated sixty degrees, so as to make it the dual of the first tetrahedron, displaced by a fourth-dimensional distance, and eight tetrahedra to join the four faces of each of the first two tetrahedra to the corresponding corner of the other one.