If the building is of historical value and protected, changes in design and selection of materials must be made in consultation with the authorities/organisations concerned. Most brands of seamless acoustic ceilings have very few, if any, customization options. Fellert Even Better on the other hand, has practically unlimited customization options, which increases the opportunity for finding an approved solution. Often, a physical sample is needed as a reference when developing a customer-specific surface texture. Photos are of course helpful, but are usually not enough. We also recommend that you construct a test installation (Mock-Up) so that you can ensure that the solution meets the set requirements, something which can often be difficult to determine simply by looking at a small separate sample.