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Message: <blockquote data-quote="jgsugden" data-source="post: 7128400" data-attributes="member: 2629">It depends upon a few things under the RAW.  When you cast the spell, everyone (but you) sees the object you created as if it were real.  Once they discern that it is an illusion, they can see through it.  But, how do you discern that it is an illusion?1.) Physical interaction with it.  If there is physical interaction, it is revealed to be an illusion.  If it has been revealed to be an illusion, you've discerned it to be an illusion and can see through it.  However, what does physical interaction involve?  Note the sentence in the PHB does not require YOU to physically interact with the object - just that there be physical interaction with it.  Once an arrow passes through the illusion, it is revealed to be an illusion and anyone that has seen the arrow pass through it can discern that it is an illusion.  A DM might require a perception check to note the arrow passing through the illusion, but that is more of a factor of seeing the arrow than seeing the illusion.2.) Without physically interacting with it, you might determine it is an illusion by spending an action to Investigate it.  You'd do this if you had a reason to suspect it is an illusion, or had a reason independent of it being an illusion, but could not prove it to be an illusion with merely a touch.  If someone stole a painting that was behind a wall of force, someone that suspects it was stolen might investigate it from behind the wall of force to see if it is an illusion - but someone also might not it is a fake illusion if they were just looking at the beautiful painting and not realizing it might be an illusion.  If you see a rock suddenly appear, you might guess that it is an illusion.  However, until you investigate it or there is physical interaction, you won't be able to see through it.So, let's say that you cast an illusion of a rock and step into it to try to get a chance to get advantage on an attack.  As you step into it, you physically interact with it.  Anyone that could see you enter the rock would know it is an illusion.  If they were on the opposite side of the 'rock' and could not see you enter it, they would still not be able to discern it is an illusion.  Once you fire at them from in the rock, if they see the arrow leave the rock, they would know it to be an illusion and it would become faint to their eyes and they could see you.  However, let's say that instead of hiding in the rock, you hide behind it.  You do not reveal it to be an illusion when you step into it.</blockquote>

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