I did an experiment today. There's a good amount of context that is helpful to understanding what I did, but for the sake of brevity, I'll omit that for now.

Essentially, I started with two identical pyramids roughly 6.5 cm in length on each base edge. Both had 4 flat triangular faces plus the square bottom. I modified one of these pyramids to more closely resemble the Great Pyramid at Giza which, based on a photograph taken at sunrise on the spring equinox in 1940 by a British Air Force pilot, has slight indentations along the vertical center line of each triangular face, meaning each triangular face, in fact, is two right triangular faces that, under normal lighting conditions, appears as a single isosceles triangular face.

I tested the modified pyramid and the unmodified pyramid with a special, purpose-built pendulum that responds in one of two ways. If the person, place, or thing being tested has one particular vibrational quality to it, the pendulum will eventually break free from the linear, back-and-forth swing and begin to move clockwise in a circular path. If that one particular vibrational quality is not present, the pendulum will simply swing back and forth like a grandfather clock's pendulum.

The pendulum behaved consistently for all trials. For the unmodified pyramid, the particular vibrational quality was detected every time. For the modified pyramid, the particular vibrational quality was never detected.

Also, I tested the modified pyramid before I modified it and after I modified it. Before modifying it, the pendulum did detect that particular vibrational quality, but after modification, the pendulum did not detect that particular vibrational quality.