MIT researchers Jiani Zeng and Honghao Deng have developed a "truly minimalist", 3D-printed flacon, which is entirely transparent at first glance and only reveals its branding when it is tilted at just the right angle. If the Nseen bottle was standing in front of a sign, onlookers would be able to see straight through it to read the words behind, without being able to see the writing on the bottle itself. In short, although the finger behind the bottle can be seen, the writing on the bottle itself is invisible. The final design is then realised using a multi-material, poly-jet 3D printer, such as the ones created by US manufacturer Stratasys. Unlike a traditional, Fused Deposition Modeling (FDM) 3D printer, these can create objects that are both transparent and fuse two or more different materials.