@Don G Rowe - Yes - R pushed the mechanism one block forward and then the star was visible and possible to collect. The level was called 'Stars That Move' and it was posted just a few days ago. No tricks were required.
@Meko Guy In this one, the star is placed between the square blocks. After the push, the star is between the first pair of horizontal columns. I haven't found a way to make it move further than that. EDIT: Saw the video for your latest post. Apparently stars can ride balls. Interesting.
@Don G Rowe in my level Moving Day there's a star attached to a fold-out arm hidden in a pull-out drawer. I like your idea of hiding it under a block.