The artwork highlights the blindness of people thinking of data as objective, unambiguous and interpretation free

thinking of data as objective, unambiguous and interpretation free修飾【blindness of people】

還是of people thinking of data as objective, unambiguous and interpretation free修飾blindness?

第二個判斷正確：

of people thinking of data as objective, unambiguous and interpretation free 修飾 blindness 。

of 后面接的是“動名詞復(fù)合結(jié)構(gòu)”。thinking 為動名詞，people 為邏輯主語。