An apparatus in one example is a portable shelter to be set up on a ground surface, the shelter having: first and second arms; a sheet connected at a first edge thereof to the first arm, and at a second, opposite edge thereof to the second arm; first and second legs intended for generally vertical alignment when the shelter is open, so that each leg has a top end and bottom end, the legs having a rotational connection at the top ends thereof to ends of the first and second arms, respectively; means attached to the bottom end of each leg for mounting the legs on the ground surface; whereby the arms and sheet may be rotated to an open position apart from the legs, to provide shelter, and may be rotated to a closed position along the legs.