Those are not the only ways that gravitational lensing has been observed. Gravitational lensing has also been detected for stars in the Galaxy lensing backgrou

Those are not the only ways that gravitational lensing has been observed. Gravitational lensing has also been detected for stars in the Galaxy lensing background stars further away in the Galaxy. While the shift in position can't be observed, the lens increases the apparent brightness of the background star as the two come into alignment over the course of a few hours or so. This phenomenon is known as microlensing [1] and it's one of the ways that exoplanets have been discovered because the exoplanets also lens the background star and produce a characteristic spike on top of the light curve. That said, microlensing is sort of statistical by nature. It's very unlikely that any particular object will be aligned with a background object just right to produce noticeable microlensing. But with a large field of stars and enough observations it becomes possible to observe a microlensing event every now and again. [1]: https://en.wikipedia.org/wiki/Gravitational_microlensing https://en.wikipedia.org/wiki/Gravitational_microlensing