For those having hard time to see, I believe expecting something to see beforehand would help you see it. I weren't able to 'see' those images, but after I saw

For those having hard time to see, I believe expecting something to see beforehand would help you see it. I weren't able to 'see' those images, but after I saw once the rest were easy. So I'll describe what you should expect to see. The image consist of 3 equal sized columns. Left and right columns are not part of the tetris field and have the same depth with the page itself (Z=0). Middle column is the tetris field with 5 playable columns which is the deepest layer on the page (Z=-2). And the tetris pieces are on an intermediate layer between those two layers (Z=-1). You now should be able to imagine what the game will be like. Hope that helps.