It was a project from Prof. Jahnke (oh!! he's good!!!). We have to build a tower (as high as we can) with sticks those not heavier than 100 gr. BUT the tower must strong to be put with 1 kg sugar. With the help from my friends, i designed my tower with a pyramide form. Every site from my pyramide has 8 equilateral triangles. Which made my pyramide more steady to hold the sugar. Although my pyramid tower is not so high (he is only 25 cm high), he is very strong to hold 1 kg or more.