Some of the improvements made to constantinople as a result of justinians public works projects are bridges, public baths, parks, roads, hospitals, hagia sophia or as called as grand cathedral. In addition, justinian was required to reconstruct constantinople when the city zones were abandoned when fighting in the hippodrome fell into the streets and intensified into a insurgence.
3D printing uses computer-aided design (CAD) to create three-dimensional objects through a layering method. Sometimes referred to as additive manufacturing, 3D printing involves layering materials, like plastics, composites or bio-materials to create objects that range in shape, size, rigidity and color.
Thomas Paine's pamphlet Common Sense made the colonist realised that these rights were something that they wanted and it made them begin to stand up for themselves since they saw that they way they were being treated wrongly and that its a better way to live life.
I would say it has to be trade
