When it comes to product testing, Sarmiento has no shortage of willing volunteers: Teresa's children Manuel (age 6), Julian (age 3), and Clara (age 1) join Teresa's sisters son Burno (age 3) in playing with the toys. The ships' rough forms were very intentional: "It was really enlightening for us to see them playing with wooden pieces that still weren't formal blocks...only wooden pieces that they found in the carpentry workshop," says Teresa.