Planet Earth contains many physical portals that link to other aspects or realities. They are physical in this dimension but move into dimensions that are beyond 3D. Portals are static. Supposedly entities called Gatekeepers monitor many of the portals. There are portals in the Great Pyramid and the Sphinx as well as other power sites on the planet especially the 12 major grid points aligned according to the Sacred Geometry . We all have portals in our homes though most of us are not aware that they are there.
Some homes have more than one portal.
They open and close at various times for different reasons - few portals remaining open all the time. They vary in size and shape. If you are clairaudient by asking your guides to create a portal and showing you how to work with it. A mirror or window is often a portal. A bathroom mirror can be used as a portal to receive messages when it is steamed up.