In 1900, Spare left St. Agnes School and gained employment at Sir Joseph Causton and Sons, a company that focused on the design of posters. Not wanting the commitment of an apprenticeship, after nine months he quit this job and instead began working as a designer at Powell's glass-working business in Whitefriars Street, which had links to the Arts and Crafts movement and William Morris. In the evenings he attended the Lambeth School of Art. Two visitors to Powell's, Sir William Blake Richmond and FH Richmond RBA, came across some of Spare's drawings, and impressed, they recommended him for a scholarship to the Royal College of Art (RCA) in South Kensington. He achieved further attention when his drawings were exhibited in the British Art Section of the St. Louis Exposition and the Paris International Exhibition, and in 1903 he won a silver medal at the National Competition of Schools of Art, where the judges, who included Walter Crane and Byam Shaw, praised his "remarkable sense of colour and great vigour of conception."