Apparatus and methods for shelter are provided. The apparatus and methods may include a channel defining an interior and a slot that extends along a length of the channel in the interior and is configured to receive a retainer that retains a wall against a surface of the channel. The apparatus may include a retainer and a wall. The channel may be supported by a support. The channel may include exterior slots. The channel may define a slot that extends along a length of the channel in the interior and is configured to receive a guide to raise and lower a wall.