Perhaps this is not broadly understood, but while hallucinations can be a sign of illness, they do not always mean a person is unwell. Hallucinations are, in fact, relatively common.
Even so, it is sensible to see a doctor following any hallucination (even if there are no other symptoms). It is especially important in someone with an illness that may cause hallucinations; with older people, who are especially susceptible to ophthalmological and neurological disorders; and in the overtaxed, exhausted, or otherwise socially, emotionally, or intellectually strained. In addition to this, MPI, while a seemingly absurd concept, is legitimate where symptoms originate from very real disturbances in the nervous system and spread among a population with shared experiences.
But, frankly, if you see something that may not be real, whether or not it in fact is, best to avoid in all cases, in my opinion. I am no botanist, but as far as my understanding of the fauna goes,
[...] the bird of paradise does not grow so quickly, or so
[...] large.
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However, if the 
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