So, I just bought a Tetris Light like this one.
With all 7 unique tetrominos, I can build a tower whatever I like and then turning them on at night to give me a good sleep, mm hm. (What a geek!)
I just realized that $7 \times 4 = 28 = 1 + 2 + 3 + ... + 7$. Therefore, with those tetrominos, I'd like to build a tower like this (white-blocks part).
Hmm, I have a difficulty building this tower. Can you help me to do that? You may rotate them but it's preferable not to flip ("mirror") them.