▁have ▁so ▁many ▁sp ind les ▁that ▁their ▁back s ▁and ▁sides ▁form ▁an ▁almost ▁solid ▁lattice work , ▁a kin ▁to ▁the ▁Arab ic ▁lattice ▁windows ▁or ▁M ash rab i ya . ▁E igh teenth ▁century ▁turned ▁ch airs ▁became ▁far ▁simpler . ▁Event ually ▁their ▁techniques ▁influenced ▁the ▁celebrated ly ▁simple ▁and ▁elegant ▁style ▁of ▁the ▁Sh aker ▁chair , ▁still ▁largely ▁made ▁by ▁turning . ▁ ▁Three - leg ged ▁ch airs ▁are ▁common , ▁particularly ▁for ▁older ▁examples . ▁The ▁evolution ▁of ▁the ▁chair ▁is ▁from ▁the ▁simple ▁back less ▁st ool , ▁commonly ▁three - leg ged ▁for ▁stability . ▁As ▁there ▁is ▁no ▁wide ▁back , ▁there ▁is ▁no ▁reason ▁to ▁have ▁more ▁than ▁one ▁rear ▁leg . ▁These ▁gave ▁rise ▁to ▁the ▁back st ool , ▁a ▁back less ▁st ool ▁with ▁one ▁leg ▁extended ▁up wards ▁and ▁later ▁w iden ed ▁by ▁a ▁flat ▁pad . ▁As ▁this ▁pad ▁developed ▁further ▁and ▁wider ▁it ▁began ▁to ▁be ▁supported ▁by ▁diagonal ▁sp ind les ▁for ▁strength . ▁These ▁gave ▁rise ▁to ▁the ▁arms ▁of ▁the ▁three - leg ged ▁turned ▁chair ▁( ill ustr ated ). ▁In ▁time ▁the ▁turned ▁chair ▁gained ▁a ▁fourth ▁leg ▁and ▁a ▁square ▁plan , ▁becoming ▁closer ▁to ▁the ▁modern ▁chair . ▁Its ▁evolution ▁is ▁through ▁these ▁three - leg ged ▁st ools ▁though , ▁not ▁from ▁the ▁square ▁ch est ▁and ▁the ▁throne - like ▁box ▁ch airs . ▁▁ ▁Se ats ▁are ▁commonly ▁solid , ▁but ▁these ▁are