Practical reasons? hahaha... one may wonder... what practical reason it has? One gets giddy after going up or down for a while... in fact, it slows one down! Well, it saves space... just go around a central pillar... and yes, we can see what's out there... er... 360 degree view!
Simply like its look... in fact, some schools use spiral staircase! For instance, in MSHS (Pri) to proceed from the general office in staff room, simply use the spiral staircase!
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