I'm sure no one has had any first hand experience on it but im looking basically for your hypothetical answers.
If you drew a large pentagram symbol on a large mirror, would it be capable of opening a portal through the mirror for you to travel through on the astral?
Pentagrams are associated with (lets say) 'magical' properties and mirrors have been known to be capable of making portals, so do you think it may be possible?
Just my strange mind wondering away, lol.