To explain the shape of figures is probably quite sufficient mechanical resonance and interference, even though sometimes it may not look like that. Also, may occur more complex electromagnetic interferences and reflections, (ie also light and heat - infrared) waves, propagating at the speed of light, and various phase boundaries between some of these media: plasma - shock wave - pressure wave - air, their phase interface is moving at speeds comparable to the sound, ie million times slower.
Upang ipaliwanag ang hugis ng mga numero ay marahil medyo Sapat mechanical lagong at panghihimasok, kahit minsan ay hindi ito ay maaaring magmukhang na. Gayundin, maaaring mangyari sa mas kumplikadong interferences electromagnetic at reflections, (ie din liwanag at init - infrared) waves, propagating sa bilis ng liwanag, at hangganan ng iba't-ibang yugto sa Pagitan ng ilan sa theses media: plasma - shock wave - presyon ng Wave - himpapawid, kanilang phase interface ay gumagalaw sa bilis na maihahambing sa ang tunog, ie Mas mabagal milyong beses.