1/2
Imagine a town where construction (transactions) is happening rapidly, and there's a local council (optimistic rollup) that must approve all the building plans (transaction data). The council's clerk (sequencer) gathers all the plans and submits them to the public noticeboard (DA layer) for everyone to

2/2
The chief architect (proposer) then reviews the plans, ensures they comply with town regulations, & updates the official town model (state root) to the new constructions. To show confidence in their work, the architect puts down a security deposit (bond) at the town hall (rollup’s enshrined bridge contract).