All rooms where liquor is sold for consumption upon the premises shall be continuously lighted during business hours by natural light or artificial white light so that all parts of the interior of the premises shall be clearly visible. In case the view into any licensed premises required by the foregoing provisions shall be willfully obscured by the licensee or by him willfully allowed to be obscured or in any manner obstructed, then the license shall be subject to revocation in the manner provided for in this chapter. In order to enforce the provisions of this section, the liquor commissioner shall have the right to require the filing with him of plans, drawings, and photographs showing the clearance of the view as above required.
('69 Code, § 3-47)