Patent ID: 8863462

Claim:
A seasonally selective structure formed at least in part by a radiation absorbing portion having a surface with at least one radiation absorbing cavity defined therein, the at least one radiation absorbing cavity being defined by an upper longitudinal surface and a lower longitudinal surface that is generally parallel to the upper interior longitudinal surface, wherein: a) the lower longitudinal surface of the at least one radiation absorbing cavity is oriented to prevent direct solar contact with at least a portion of the at least one radiation absorbing cavity during summer months; and b) the at least one radiation absorbing cavity is oriented to absorb solar radiation in winter months by permitting direct solar contact with at least a portion of the at least one radiation absorbing cavity, the at least one radiation absorbing cavity being configured to permit incident direct solar radiation to undergo multiple reflections within the at least one radiation absorbing cavity between the upper and lower longitudinal surfaces during winter months.