| CPC A63H 33/046 (2013.01) [A63H 33/06 (2013.01); A63F 2007/3662 (2013.01)] |

| AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT: |
| The patentability of claims 1, 4, 7 and 13 is confirmed. |
| Claims 2-3, 5-6 and 8-12 were not reexamined. |
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1. A building system comprising:
a plurality of magnetically-connectable frames that include magnetic elements to enable each frame to be magnetically attracted to another frame, at least two frames including an outer frame wall, a first wall, a second wall opposite the first wall, and an interior frame wall encasing the magnetic elements within the frames, the first and second walls connecting the outer frame wall and the interior frame wall;
the at least two frames further including a protuberance centrally disposed along the interior frame wall, the protuberance having a predetermined height and being disposed a distance from first and second walls thereby forming a first and a second shelf, the first shelf facing the first wall and defining a first inset distance between the first shelf and the first wall and a second inset distance between the second shelf facing the second wall, the first and second inset distances being approximately equal;
a plurality of interchangeable panels, each of the panels having a thickness and being capable of being releasably and stably mounted in one of the frames to form a building tile, at least two panels including a panel face and a rear panel wall opposite the panel face, the rear panel wall having at least one flange with curvature angled toward an edge of the panel, the curvature configured to mate with the protuberance on the frame from either the first wall or the second wall of the frame;
wherein each of the panels can be placed in a position of stable equilibrium within either of the two frames or removed therefrom simply by manually applying pressure to the panels and frames without disassembling or permanently deforming any part of either the frame or the panel and without the use of tools.
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