Lagar arrived in Barcelona in 1910, and was a pupil of Miguel Blay and was originally engaged in sculpture together with his good friend the sculptress Hortense Begue, with whom he exhibited frequently and who was to become his wife. They both became established in Gerona in 1915.
Lagar was the painter of the underprivileged and between tenderness and melancholy he reflected the marginal world without ever piercing the vein of tragedy. He captured the life of the peoples fairs and of the circus with its harlequins, dancers, acrobats, its trapeze-artists and its clowns. But he was also interested in bullfighting, taverns, seascapes and landscapes. His vagabond spirit took him from one place to another and he always moulded the vision of each place into his painting.