>>10942031molecular nanotechnology could enable technology that is almost magic. Making a cake from something as thin as a picture would be extremely difficult. At best we could probably make something like cotton candy aerogel. Even that will be very hard, a quick napkin calculation requires that the density of the cake be less than the lightest aerogel. We can potentially obtain some materials for the cake from the air, but then we run into issues with energy storage and mass flux.
