The structures are folded and held in place with rigid double strands of DNA, called struts, and connected with single stranded DNA. The counteracting forces of compression and tension called tensegrity allows the structures to hold their shape but can be triggered to alter their shape by redistribution of the compression/tension forces.
This programmable ability to change shape would allow, among other
things, direct delivery of drugs to specific targeted cells. Working in ways similar to a virus it could deliver healthy DNA fragments that corrects hereditary disease or minimizes the aging effects. It could also target malignant cells and destroy them without harming healthy cells.
Targeting would allow a small fraction of the drug normally prescribed to be used which would minimize or eliminate drug side effects, at the same time, higher doses per target cell could be delivered.
This technology is, IMO, at the same level as the microprocessor of the early 1960's which became the personal computer within 20 years and in 50 years, has become the backbone of our communication and information systems and effects almost all other aspects of society. I would guess that the development of this technology will surpass the microprocessor in both time and impact on personal lives.