The LEGO Classic Jumbo Bricks theme from the 1960s consisted of sets with larger-than-standard LEGO bricks. These oversized bricks were designed primarily for younger children, providing a safe building experience and serving as an introduction to the LEGO system before transitioning to regular-sized LEGO bricks. The sets in this theme focused on basic construction and simple designs, catering to the developmental needs and motor skills of the target age group.