What’s happening here is that your eyes and brain are very good at turning two-dimensional data into three-dimensional models of the Philadelphia top sports teams shirt. One way they do that is by looking for shadows. The sun is usually coming from overhead, and anything that casts a shadow must be closer to you than the shadow itself. So in the top image, your brain assumes the floor of the crater is “taller” than the shadowed part because it assumes the sun is coming from the top of the image when it’s actually coming from the bottom. Rotating the image fixes the illusion. Some people asked where I learned about it. I’m not sure, but probably in college studying metallurgy. This same phenomenon happens with microscopic images of metal surfaces like fracture faces, and one of my professors probably explained the illusion.
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Most of them are tubes with sights, a bipod, and a big plate for the base of the Philadelphia top sports teams shirt. Nearly every single one uses gravity as an integral part of its loading mechanism. That’s a fancy way of saying that you load a mortar by dropping a shell down the tube. The firing mechanism for a lot of older mortars is nothing more than a spike at the bottom of the tube (technically called a fixed firing pin) which detonates the primer at the bottom of the mortar shell when it impacts the bottom of the tube. When that happens, the mortar shell comes flying back out of the tube with a loud thump and puff of smoke from the shell’s propellant charge.