When I Investigate And When I Discover

Philosophers Say That Nothing Can Be Seen That Is Neither Illuminated Nor Colored.

It Was Never Shameful To Learn From Any Teacher Things That Are Useful To Know.

I Would Have Artists Be Convinced That The Supreme Skill And Art In Painting Consists In Knowing How To Use Black And White... Because It Is Light And Shade That Make Objects Appear In Relief.

I Will Never Tire Of Recommending The Custom, Practiced By The Best Architects, Of Preparing Not Only Drawings And Sketches, But Also Models Of Wood Or Any Other Material. These... Enable Us To Examine... The Work As A Whole... And, Before Continuing Any Further, To Estimate The Likely Trouble And Expense.

Errors Accumulate In The Sketch And Compound In The Model.