The main construction toys makers were the Erector sets of A.C. Gilbert and their English made competitor, Meccano. Additionally, construction toys of wood, brick and plastic-such as Lincoln Logs, Anchor Blocks, and Lego helped teach principles of building. Lego continues to be an extremely strong brand and produces many TV and film related models including Star Wars and Harry Potter with some set despite being produced in the last 20 years being highly collectable.