US Patent 7238026 Activity device

A multiple-sided activity device for toy blocks is disclosed. The activity device has a first side including a first activity adapted to interact with at least one of the plurality of toy blocks. The activity device also has a second side distinct from the first side, the second side including a block recognition mechanism configured to selectively interact with any of the plurality of toy blocks to identify which of the plurality of toy blocks is interacting with the block recognition mechanism and to produce block-specific sensory stimulating output.