Phavilioni ya Expo Okitagonyo—mawonekedwe a jiometeri omwe Nikola Tesla anasankha pa nsanja yake—adalimbikitsa kapangidwe ka gulu lapadera la maphavilioni. Pomanga nsanja yake mwatsopano ndi matekinoloje ogwiritsira ntchito mphamvu bwino ndi kupanga malo owonera kukhala gawo lake lalikulu, gulu la zomangamangalo limaphatikizapo maphavilioni asanu ndi atatu oikidwa mozungulira maziko a okitagonyo a nsanjayo. Kapangidwe katsopano aka kungakhale chizindikiro chamtsogolo cha malo aliwonse a expo yapadziko lonse lapansi. Atrium yogalidwa magalasi, yothandizidwa ndi mizati yomangidwa ngati mphezi, imawonjezera chizindikiro chophiphiritsa ndi chowoneka kwambiri.
Dzina la polojekiti : Octagon, Dzina laopanga : Dr Aleksandar Rudnik Milanovic, Dzina la kasitomala : Studio RUDA.
Dongosolo lalikulu ili ndi wopambana mphoto ya mkuwa pakapangidwe kamangidwe, zomanga ndi kapangidwe kake. Muyenera kuwona mawonekedwe opanga opereka mphoto zamkuwa.