While the trichromatic theory defines the way the retina of the eye allows the visual system to detect color with three types of cones, the opponent process theory accounts for mechanisms that receive and process information from cones.
Cost of Soundproofing One Room. The cost to soundproof one room generally includes $170 to $250 for new materials, $190 to $300 for professional labor and $20 to $36 in tools needed to complete the job, though the prices will be higher for larger rooms and more complicated projects.
Bathroom waterproofing can cost as little as $35 per square metre, but that is the low end of the scale. In general, professional waterproofing costs between $500 and $750 for an average bathroom. If the waterproofing is done in more than one bathroom or as part of a complete bathroom renovation, the cost may be lower.