lupa

A lupa is a hole. Here's what that means: these holes can go through objects, like the hole in a donut, or they can be an indentation in an object, such as a hole dug in the ground. Things that are lupa continue to be lupa even when there is something blocking them, like a door or a window, because they are still meant for things to pass through them. From a perspective of function, that's what lupa are for. A lupa is a part of an object that things can pass through. A door is still a lupa because people can open it, and a window is still a lupa because it's meant for light to pass through. Empty space is not a lupa because it's not part of an object. The semantic space can be extended to describe other things that fit this description, even if they aren't physical holes, such as portals or links on the internet. You can read more about lupa here.