The Simple Proof of the Tetris Lamp
A few things:<p>1) Why limit yourself to 4x7?  The 1988 NES version of Tetris is 10 units wide.<p>2) There isn't any malicious design, you simply get 1 of each shape (one of the L pieces in the author's photo is reflected, should be turned the other way).<p>3) In Tetris, a full row is removed immediately so having a complete rectangular shape that occupies the full available width is unrealistic.<p>Pedantry aside, you'd have to ask Alexey Pajitnov if there was any devilry involved in choosing the shapes since the makers of the lamp have faithfully included a full set.  Also, I personally prefer the aesthetic of a lamp arranged in such a way as to leave a hole in each row rather than a plain wall of coloured squares.