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open on (something)
To begin with some specific thing. The panel discussion opened on a debate about the proposed tax reform legislation. The film opens on a shot of the hero looking out over the valley at dusk.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
open (out) on(to) something
[for a building's doors] to exit toward something. The French doors opened out onto the terrace. The doors opened on a lovely patio.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.