It has always been a 'different' kind of song, but honestly back then I loved it. Donovan always came out with songs that had a bit of a different twist and tone to them. Maybe it was his heavy accent but it sounded cool to me back in those days.
Good choice by the way. I haven't heard that tune in eons, but it brings back some great memories. Got me looking at Youtube for more and sure enough, here are 2 more that fall into that 'odd' category but definitely something for the enlightened hippies.