Moonbase Central Park (UFO TV series)

The Central Park Sphere is a fictionnal place that appeared in a few episodes of the Gerry Anderson TV show UFO. Located at the center of the Moonbase facility, this film set was also used as a moonbase gymnasium room in a few episodes, like "The man Who Came Back" or the "The Cat with seven Lives"
I believe the room was partially built so, to fill the gaps, I mirrored a few walls and doors