Transparent structure for a window, said transparent structure being provided with a transparent supporting wall which is immovable in a frame of reference of the transparent structure, the supporting wall defining an opening, the transparent structure comprising a transparent movable wall, said movable wall being movably mounted on said supporting wall so as to seal said opening in a closed position (POSF) and so as not to seal at least part of said opening in an open position (POSO), the thickness of said supporting wall extending from a first immovable surface to a second immovable surface, the thickness of said movable wall extending from a first movable surface to a second movable surface, in which: - a joint is supported on the supporting wall, said joint surrounding said opening, said joint being compressed by said movable wall in the closed position (POSF), - said movable wall is rotatably mounted on said supporting wall, said movable wall being pivotably connected to said supporting wall by means of at least one hinge mechanism, each hinge mechanism having an immovable element, a movable element and a pivot which pivotably connects the immovable element to the movable element, said pivot extending along a rotational axis, said rotational axis being offset with respect to said joint in the transverse direction by being located in a plane orthogonal to the second immovable surface and not passing through the joint, said rotational axis being upwardly offset with respect to said joint by not being contained in said opening, said immovable element comprising a surface referred to as the "immovable bearing surface " which is rigidly connected to the supporting wall, said immovable bearing surface facing the second immovable surface and being contained in a plane referred to as the "immovable plane ", the movable element comprising a surface referred to as the "movable bearing surface " which is rigidly connected to the movable wall, said movable bearing surface facing the second movable surface and being contained in a plane referred to as the "movable plane ", - said transparent structure comprises at least one catch for securing said movable wall in the closed position (POSF) on request, characterised in that the movable plane and the immovable plane are separated by an angle of between 0 and 180 degrees exclusive in said closed position (POSF). - a joint is supported on the supporting wall, said joint surrounding said opening, said joint being compressed by said movable wall in the closed position (POSF), - said movable wall is rotatably mounted on said supporting wall, said movable wall being pivotably connected to said supporting wall by means of at least one hinge mechanism, each hinge mechanism having an immovable element, a movable element and a pivot which pivotably connects the immovable element to the movable element, said pivot extending along a rotational axis, said rotational axis being offset with respect to said joint in the transverse direction by being located in a plane orthogonal to the second immovable surface and not passing through the joint, said rotational axis being upwardly offset with respect to said joint by not being contained in said opening, said immovable element comprising a surface referred to as the "immovable bearing surface " which is rigidly connected to the supporting wall, said immovable bearing surface facing the second immovable surface and being contained in a plane referred to as the "immovable plane ", the movable element comprising a surface referred to as the "movable bearing surface " which is rigidly connected to the movable wall, said movable bearing surface facing the second movable surface and being contained in a plane referred to as the "movable plane ", - said transparent structure comprises at least one catch for securing said movable wall in the closed position (POSF) on request,