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The importance Welcome to my man cave also known as the freemason room poster of sound in caves predates a modern understanding of acoustics. Archaeologists have uncovered relationships between paintings of dots and lines, in specific areas of resonance, within the caves of Spain and , as well as instruments depicting paleolithic motifs, indicators of musical events and rituals. Clusters of paintings were often founds in areas with notable acoustics, sometimes even replicating the sounds of the animals depicted on the walls. The human voice was also theorized to be used as an echolocation device to navigate darker areas of the caves where torches were less useful. Dots of red ochre are often found in spaces with the highest resonance, where the production of paintings was too difficult. Here, singing is to be the most efficient way to explore caves.