Sentence:  Another instance of someone who is <WSD>blackberrying</WSD> and sees fairies can be found at Kingheriot Farm ("South-West Wales: Pembrokeshire"): maybe gathering berries puts the percipient into a relaxed or dissociated frame of mind, more conducive to being able to see things that one would perhaps not normally be able to see. 
Meaning of the word marked with <WSD> tags:  To gather or forage for blackberries.