Per 
Item Number SCP-5506
Object Class: Euclid (Previously Safe)
Special Containment Procedures: SCP-5506 is to be locked in a 5Mx5Mx5M Cell made up of 6 inch plates of steel outlined with a metal mesh that is capable of temporarily disabling any electronic devices that enter the cell. Under no circumstances should any Class-A or Class-B Personnel enter SCP-5506's Chamber at any time.
Description: SCP-5506 is a Blue crystal, 36cm across and 19cm high when first seen. SCP-5506's anomalies effects only occur when a human gazes upon it. SCP-5506 Will stay the same size according to the perspective of what we will refer to as SCP-5506-1. SCP-5506-1 Will instinctively back away from SCP-5506. As SCP-5506 moves away, SCP-5506's size does not seem to change to SCP-5506-1. Meaning if SCP-5506-1 Looked at SCP-5506 and walked a Kilometer away, it would look the same size. Attempting to approach SCP-5506's "New Size" will result in failure unless movable according to size. Taking away visual contact seems to have no affect on SCP-5506-1 and any personnel who gaze upon SCP-5506 is to be terminated. Attempts to force SCP-5506-1 back into the radius have resulted in failure, and in some occasions crushed them depending on the force. Attempts to destroy SCP-5506 have been unsuccessful.
Addendum:
SCP-5506 was moved to Euclid class due to an incident where it phases through the walls of the containment Cell and 3 staff saw it. 2 Researchers & 1 MTF Lieutenant.
Doctor [Data Redacted] KIA
Doctor [Data Redacted] KIA
MTF Lieutenant [Data Redacted] KIA
End Log.
