the mounting board 10 and the shelf 16 in fig7 shelf 16 has a grooved plate 82 adhering the lower major surface 52 a second grooved plate 83 is positioned on the front major surface 12 below shelf 16 and aligned with grooved plate 82 a press in rectangular clip 84 may be inserted between plates 82 and 83 to lock the position of shelf 16 press in clip 84 may be supplied in different sizes to support different angles of support for the support member in fig8 shelf 16 is supported by a linked chain 92 which is attached at one end to a hook 88 positioned on the mounting board 10 above shelf 16 and extending forward from front major surface 12 the chain 92 extends from hook 88 to an open hook 90 mounted in shelf 16 at the end distal to hinge 64 and extending upwardly from upper major surface 18 fig9 illustrates a mounting board 10 positioned on an incompletely vertical branch fig1 illustrates installation of a mounting board 110 as a back wall of a birdhouse 98 brackets 94 attached to the back of the birdhouse substitute for notches or slots to allow attachment of retaining belts 34 and 36 which here loop the tree and the brackets rather than the whole backplane a hook 120 attached to the birdhouse floor allows items such as thermometers to be hung from the object fig1 illustrates a mounting board 140 of the preferred embodiment of the invention employed as the backwall to a birdhouse 98 adjustable.