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A physical experiment to study the topic is the propagation of light in space, the law of the straightforward propagation of light is the creation of a shadow.
Ruins of Pumapunku or Puma Punku, part of a large temple complex or monument group that is part of the Tiwanaku Site near Tiwanaku, Bolivia
It is symbolical the staff (danger always beside).
Angled Helicopter
Mathematical School Science Geometrical Axes Concept. 3D Cartesian coordinate system with labeled X, Y, and Z axes.
line pattern in olive orange and brown, in the style of constructivist elements, intersecting lines, light beige and black, bold colorful lines, bauhaus simplicity, rectilinear forms, wallpaper

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