I know exactly what you mean, Piffka. For quite some time after the death of one of my beloved cats I sort of "see" shadows of them, out of the corner of my eye. In my case I think it's expecting them to be there, so some movement, some half-see blurred shape becomes them! AND I suspect, their little spirits linger around, for a bit!
Piffka, please call me Olga. I think we know each other well enough to dispense with formalities? :wink: