A gravity locking mechanism comprising a mounting structure and an article removably mountable to the mounting structure: wherein the mounting structure that is rigidly supported on a surface, and comprises a first alignment surface; a first locking surface; and a first load surface; and the article lockable on the surface that includes: an alignment structure fixed to the article, that defines a second alignment surface complementary to the first alignment surface that enables alignment of the article with the mounting structure via engagement with the first alignment surface; a gravity load structure movably attached to the article, that is biased by gravity toward an unrestrained position, and that defines a second load surface configured to bear against the first load surface and move the gravity load structure away from the unrestrained position as the article is moved toward a mounted position relative to the mounting structure; and a locking structure movably attached to the article, that is configured such that a movement of the gravity load structure away from and toward the unrestrained position corresponds with a movement of the locking structure toward and away from a closed position respectively, and such that the locking structure is in the closed position when the article is in the mounted position, the locking structure defining a second locking surface that engages the first locking surface in the closed position to delimit the corresponding movement of the locking structure and the gravity load structure, such that as at least a portion of a weight of the article is supported on the first load surface via the second load surface, the second locking surface is urged against the first locking surface to hold the mounting structure captive between the locking structure and the alignment structure and lock the locking mechanism. wherein the mounting structure that is rigidly supported on a surface, and comprises a first alignment surface; a first locking surface; and a first load surface; and the article lockable on the surface that includes: an alignment structure fixed to the article, that defines a second alignment surface complementary to the first alignment surface that enables alignment of the article with the mounting structure via engagement with the first alignment surface; a gravity load structure movably attached to the article, that is biased by gravity toward an unrestrained position, and that defines a second load surface configured to bear against the first load surface and move the gravity load structure away from the unrestrained position as the article is moved toward a mounted position relative to the mounting structure; and a locking structure movably attached to the article, that is configured such that a movement of the gravity load structure away from and toward the unrestrained position corresponds with a movement of the locking structure toward and away from a closed position respectively, and such that the locking structure is in the closed position when the article is in the mounted position, an alignment structure fixed to the article, that defines a second alignment surface complementary to the first alignment surface that enables alignment of the article with the mounting structure via engagement with the first alignment surface; a gravity load structure movably attached to the article, that is biased by gravity toward an unrestrained position, and that defines a second load surface configured to bear against the first load surface and move the gravity load structure away from the unrestrained position as the article is moved toward a mounted position relative to the mounting structure; and a locking structure movably attached to the article, that is configured such that a movement of the gravity load structure away from and toward the unrestrained position corresponds with a movement of the locking structure toward and away from a closed position respectively, and such that the locking structure is in the closed position when the article is in the mounted position, the locking structure defining a second locking surface that engages the first locking surface in the closed position to delimit the corresponding movement of the locking structure and the gravity load structure, such that as at least a portion of a weight of the article is supported on the first load surface via the second load surface, the second locking surface is urged against the first locking surface to hold the mounting structure captive between the locking structure and the alignment structure and lock the locking mechanism.