In the 1970s two scientists at the British Museum and the National Gallery in London did some research and made recommendations to their institutions based on the requirements of the HVAC system to maintain human comfort.
"This tap test, with its hands-on interaction with the art and intrusive scaffolding to access works in the vaulted ceilings, is a manual and highly subjective process."
"Medical Research Through the Ages," a massive metal and tile mosaic depicting scientists and lab equipment, has been visible through the high glass-windowed lobby of the pharmaceutical giant's midtown Manhattan office since the 1960s.