The 100% cotton Ninjago Spinjitzu Boxes Kids T-Shirt may illustrate the most dangerous being in the known universe. Think about it - ninjas are already pretty intimidating but then you make them out of Legos? I think that's how you make the Black Angel of Death! Okay, so joking aside the Ninjago Spinjitzu Boxes Kids T-Shirt is based on the Lego franchise involving spinning...and ninjas. I'm not entirely sure but I'm sure you can find a little one who can explain in further detail.