Reported with some consistency but carrying no origin claim in the encounters themselves. Filing these as alien is an assumption the listener adds.
Degree of embodiment: 2, energetic or subtle
Scale, 1 to 5
5 is an ordinary biological body. 4 is physical but manifests oddly. 3 comes and goes. 2 is energetic or subtle. 1 is consciousness with no persistent form. Note that this tends to fall as a tradition ages.
E: recurring reports
Source code
Described by many apparently unconnected witnesses. The strongest category in the guide, and the smallest.
Foo fighters
1940s
Luminous spheres reported by aircrew of several nations during the Second World War, apparently pacing aircraft. A genuine reporting category predating the modern UFO era.
The photographic problem
Caveat
Dust and moisture close to a camera flash render as bright circles. The digital era produced an enormous volume of these, which contaminates an otherwise long-standing reporting category.
No practice attached
Tradition-side
There is nothing to do here: no inherited method of engagement, whether the tradition is a text, an argument or a set of reports. Anyone offering you one has invented it.
Deliberate contact work
Read this first
The hazard in this subject attaches to the method, not to which name you aim it at. Ouija work, invocation, sustained channelling, induced hypnagogia, deliberate sleep deprivation and hypnotic regression are the practices associated with difficulty, and a session aimed at a benevolent civilisation is not safer than one aimed at something considered lower. What raises risk is doing it alone, doing it repeatedly, doing it while sleep-deprived, and doing it with an existing vulnerability to psychosis, mania or dissociation. People who get into trouble here overwhelmingly got there through practice, not through reading.
Who should be careful
Practice-side
Anyone with a personal or family history of psychosis, bipolar disorder or dissociative conditions, anyone in acute crisis, and anyone isolated from people who would notice a change in them. Intensive contact practice is destabilising by design (that is what it is for), and destabilisation lands hardest on people already close to an edge.