Na osnovu svog iskustva, Mike Dunn vjeruje da je najjednostavniji nacin za izgradnju velikih zidova Machu Picchua mogao biti transport manjih kamenja do gradilista, a zatim njihovo topljenje, i koristenje kalupa za oblikovanje potrebnih velicina i oblika.
Based on his experience, Mike Dunn believes the simplest way to build the great walls of Machu Picchu would have been to transport small rocks to the site, then melt them, and use molds to fashion exact size and shape needed.