The building containing SCP-4096, prior to containment

Existing as a complex topological manifold nested within a portion of wall in the now-derelict records office for the city of Hereford, England, SCP-4096 represents a method of reversing the two opposing sides of an established dichotomy, thereby swapping the two members of an opposite or antithetical pairing. This effect is permanent unless SCP-4096 is used to reverse it, and extends only to the surrounding area. Since SCP-4096 is both physical and non-defined in physical terms except the abstract, its position cannot be externally altered. As a minor overcompensation for continental drift, SCP-4096 moves approximately 0.4cm north each year.

The following is a list of all recorded uses of SCP-4096:

2018-06-12: Activated by civilian, reversing the pairing of night and day in a radius of 100m. The moon became a ball of incandescent plasma and the sun became a colossal sphere of glowing rock. This change only affected reality within the area of effect.

2018-06-14: Activated by initial containment team, reversing the pairing of red and blue in a radius of 100m. All electromagnetic radiation was mirrored on the E-M spectrum about the point 545 nanometres. The resultant property damage and loss of life extended well past the area of effect, with a death toll of 24 staff, 9 civilians.

2018-06-29: Activated by a team of research staff, reversing the pairing of good and bad in a radius of 100m. One survivor, currently incarcerated.

2018-07-11: Activated by member of D-Class personnel, reversing the pairing of big and small. Subject deceased, bacteria neutralised after thirty-eight hours. No spatial distortions observed.

2018-07-21: Activated by member of D-Class personnel, reversing the pairing of big and small in a radius of 100m. Building underwent structural integrity failure, subject was located crushed under wristwatch.

2018-08-01: Activated by member of D-Class personnel, reversing the pairing of broken and unbroken in a radius of 100m. Building underwent structural integrity, subject was located broken.

2018-09-02: Spontaneously activated, reversing the pairing of normal and abnormal in a radius of 200m. Investigatory team inadvertently activated SCP-4096 during their retrieval of various anomalous objects, which have since been placed into storage — a secondary volume has been added to the Log of Anomalous Items to compensate.

2018-09-03: Activated by investigatory team, reversing the pairing of up and down in a radius of 250m. MTF Theta-90 ("Angle Grinders") were dispatched to reverse the effect; before an activation could be triggered, SCP-4096 spontaneously self-activated.

2018-09-03: Spontaneously activated, reversing the pairing of willing and unwilling in a radius of 500m. MTF Theta-270 left the area of effect almost immediately. A number of insects were released into the building, and a team of entomophobic D-Class personnel were dispatched to attempt to determine the source of the activations.

2018-09-03: Spontaneously activated, reversing the pairing of forward and backward in a radius of 950m. D-Class continue to reverse towards the anomaly after a moment of confusion.

2018-09-03: Spontaneously activated, reversing the pairing of inside and outside in a radius of 1.6km. Those inside buildings went outside, while the external monitoring team went or became inside. Since SCP-4096 was intersecting the wall of the records office, it remained in place.

2018-09-03: Spontaneously activated, reversing the pairing of speech and silence in a radius of 20km. SCP-4096 pleads continuously for several minutes; since all persons present were only capable of hearing silence, no action was taken.

2018-09-03: Spontaneously activated, reversing an unknown pairing over an unknown radius.

2018-09-04: Spontaneously activated. See current description.