The most moving and poignant part of the day is the memorial siren. At 10am for two minutes everything stops. The traffic on the busiest streets stands still with the drivers standing on the road next to their vehicles. The pedestrians in the street become statues. The lights change from green to red and back to green again but no one notices. There is an eerie silence. You feel the weight of remembering on your shoulders. You try to remember harder. Most of us today weren't even born then - but still we remember.