A technical patent drawing from 1961 illustrates the exploded assembly of an interlocking brick toy system, rendered in detailed mechanical line work against a weathered cream background. Multiple cross-sectional views show the construction layers and internal mechanisms with the precision of an engineering schematic, creating a sense of nostalgic innovation and industrial clarity. Printed on smooth white card stock and made to order, artwork on the front, blank inside, envelopes included in every set. A handwritten note that arrives as an independent artist's work.