The twenty liquidity positions behind CEN, locked so they can never be pulled.
A liquidity wall is a one-sided liquidity position: CEN is deposited into a pool paired against another token, and the position card that represents that liquidity is locked. Because the card can never be withdrawn, the liquidity stays in the market forever — nobody, including us, can pull it out from under buyers and sellers.
There are twenty locked walls. Fifteen pair CEN against the fifteen endowment tokens — the five causes (Art, Environment, Education, Humanitarian, Overhead) each in three asset flavors (USDC, WETH, cbBTC). Five pair CEN against major assets as hubs so anyone can enter or exit CEN against real liquidity: CEN/USDC (the pricing hub), CEN/WETH, CEN/cbBTC, CEN/RWI, and CEN/MfT.
The point of locking is trust-minimization: you do not have to believe the liquidity will stay — you can check on-chain that the position cannot be moved. This is the floor the whole economy stands on.