With the light feather, I managed to get onto the top floor of the ship (with the table) through jumping from a higher place with the light feather. I got on it, but once there I discovered I could only walk on the block I was standing on, every other block around me was blocked (haha). Using the feather, I could jump on other blocks around me, but if not using the feather, it was as if there were fences all around my block. I could get off onto the normal floors of the ship though, and I could walk around normally again.

I've discovered several other areas like this, where the feather can jump on them, but I can't walk around freely, only jump. Not even the roll works, I need the feather to get around.