The picture shows a man、A boy and a dog, The art of math by Gavin Hamilton

The picture shows a man、A boy and a dog, The art of math by Gavin Hamilton, Reddit, The art of math, Grandfather, in Norman Rockwell style, Lovely artwork, official illustration, Norman Rockwell style, cute illustration, author：rainer hosch, great character design, Norman Rockwell style, childrens illustration, Older men, illustration | Rutkowski

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