40 transparent flags are set in this site. This area is closely-linked to a river beside this site. Transparent flags make line from the river to a main stage of this event. It shows the relationship between the river and the site.

Pamphlet says "Taipei Visible and Invisible" is Taipei city government's manifestation celebrating the hidden soul of the city. It is also a project to help citizens rediscover their natural environment and reconstruct a lost communal relationship.