Portrait of Paul O'Brien Half-length portrait of Paul O’Brien seated in an office and looking out to viewer. He is writing the equation En = n2h2 /8mL2 in a book, referring to the energy levels of an electron confined to a one-dimensional box. He is wearing a dark suit with a tie showing the periodic table which he wore during his extensive outreach activities. He is also wearing his Fellow of the Royal Society pin badge on his right lapel. Posthumously painted from a photograph and set in an imaginary office representing O’Brien’s five different work spaces. The portrait is staged with significant objects relating to O’Brien’s life and work. 2023