That is subject to interpretation (and lots of debates... I can provide links to them if you desire), so both interpretations have merit. However, WotC customer service has said (here) that nondetection protects you from see invisible. That's enough of a tie breaker for me (even though I previously interpreted it as you do).Nifft said:1/ Nondetection fails against see invisibility (not a Detect spell, nor a remote viewing spell).
I would consider the opening for a rope trick to be an object. Something need not be solid to be considered an object. If it is not an object, then there is probably nothing to see. Besides, it's been previously determine that spells are objects for the purpose of targeting (otherwise spells could not be targeted by dispel magic, as the target line for that spell is "One spellcaster, creature, or object").2/ Rope trick is not a creature or object, and thus you can't cast nondetection on it anyway.
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