The blockchain community has recently been talking about the 'explosion of Rollups', but have you noticed? Today's Rollups are like a row of independent small shops: Optimism is a coffee shop, Arbitrum is a bookstore, ZK Rollup is a flower shop, each with its own customer flow, yet there isn't a proper skywalk—want to buy a latte from the coffee shop and then borrow a book from the bookstore? You need to go outside, walk half a street, and go through security again (cross-chain verification)😮‍💨. What Caldera is doing is building a 'commercial complex' for these small shops, using Metalayer as the 'skywalk', allowing all Rollups to visit each other, share customer flow, while still maintaining their unique features.