What is so important about the number 7?
The number 7 is significant in almost every culture around the world.
Because Bitcoin is a universal currency, the number 7 allows us to bridge the gap between the (7) continents by creating these 'Dynamic Heptagon' shapes. Each heptagon can resemble specific locations throughout the world.
B-I-T-C-O-I-N also happens to be 7 letters.
Read more about the number seven at Wikipedia