File:Philosopher, Ferdinand Bol, 1642, etching and dry-point, second state, 21.0 by 16.5 cm (plate), Rijksmuseum Amsterdam RP-P-BI-1994.jpg
![File:Philosopher, Ferdinand Bol, 1642, etching and dry-point, second state, 21.0 by 16.5 cm (plate), Rijksmuseum Amsterdam RP-P-BI-1994.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/3/33/Philosopher%2C_Ferdinand_Bol%2C_1642%2C_etching_and_dry-point%2C_second_state%2C_21.0_by_16.5_cm_%28plate%29%2C_Rijksmuseum_Amsterdam_RP-P-BI-1994.jpg/468px-Philosopher%2C_Ferdinand_Bol%2C_1642%2C_etching_and_dry-point%2C_second_state%2C_21.0_by_16.5_cm_%28plate%29%2C_Rijksmuseum_Amsterdam_RP-P-BI-1994.jpg?20191109095731)
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