NYC · World Trade Center Mission Postcard

A 5×7 keepsake for the World Trade Center walk — the true-scale solar system stroll that starts at the Koenig Sphere in Liberty Park and runs eight stops up Manhattan.

The artwork on the front is commissioned from an artist and paid for. Never generated.

The back is an AR target too, so if you'd rather not carry the wallet card, hold up the postcard at each planet instead — it's tracked at its own true size.

• 5 × 7 in (127 × 178 mm)

• Front: commissioned artwork for this walk

• Back: AR target and this walk's own code

• Works with the free walk — no app to install

The walk itself is free. See the route at solarsystem.city/explore/nyc-wtc