All home occupations shall be clearly incidental and secondary to the use of a dwelling or accessory structure for residential or agricultural purposes, and the appearance of the structure shall not be altered or the occupation within the dwelling or accessory structure be conducted in such a manner which would cause the premises to differ from its residential or agricultural character by either the use of colors, materials, construction, lighting, signs, or the emission of sounds, noises, odors or vibrations. In no case shall any home occupation be open to the public at times earlier than 8:00 a.m. nor later than 10:00 p.m.