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:root {
--sidebar-width-on-desktop: calc(var(--base-font-size) * (266 / 15));
--body-width-on-desktop: 45.75rem;
}
@media only screen and (min-width: 56.25rem) {
#content-wrap {
display: flex;
position: initial;
flex-direction: row;
flex-grow: 2;
width: calc(100vw - (100vw - 100%));
max-width: inherit;
height: auto;
min-height: calc(100vh - var(--final-header-height-on-desktop, 10.125rem));
margin: 0 var(--sidebar-width-on-desktop, 13.6rem) 0 calc(var(--sidebar-width-on-desktop, 13.6rem) * -1 / 2);
}

#main-content {
position: initial;
width: var(--body-width-on-desktop, 45.75rem);
max-width: var(--body-width-on-desktop, 45.75rem);
max-height: 100%;
margin: 0 auto;
padding: 2rem 1rem;
}

#page-content {
max-width: min(90vw, var(--body-width-on-desktop, 45.75rem));
}

#side-bar {
position: -webkit-sticky;
position: sticky;
top: 0;
left: 0;
grid-area: side-bar;
width: var(--sidebar-width-on-desktop, 13.6rem) !important;
min-width: var(--sidebar-width-on-desktop, 13.6rem) !important;
max-height: 100vh;
padding-right: 2.5rem;
padding-left: 0.5rem;
overflow-y: scroll;
transition:
translate 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
background-color 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
padding 300ms linear,
margin 300ms linear;
border: none;
border-color: rgba(var(--swatch-tertiary-color, 170, 170, 170), 0.4);
background-color: rgba(var(--sidebar-bg-color, 255, 255, 255), 0);
translate: calc(var(--sidebar-width-on-desktop, 13.5rem) * -1 - 1rem);
direction: rtl;
scrollbar-width: thin;
-ms-scroll-chaining: none;
overscroll-behavior: contain;
scrollbar-color:
rgba(var(--swatch-primary-darker), 0.1) /* Thumb */
rgba(var(--swatch-tertiary-color), 0.05); /* Track */
}

#side-bar::-webkit-scrollbar-track {
background-color: rgba(var(--swatch-secondary-color, 244, 244, 244), 0.8);
}

#side-bar::-webkit-scrollbar,
#side-bar::-webkit-scrollbar-thumb,
#side-bar::-webkit-scrollbar-corner {
width: 0.5rem;
border-right-width: calc(100vw + 100vh);
border-right-style: inset;
border-color: inherit;
background-color: rgba(var(--sidebar-bg-color, 255, 255, 255), 0);
}

#side-bar:is(:hover, :active, :focus-within) {
margin-right: 2.25rem;
padding-right: 0.25rem;
overflow-x: hidden;
overflow-y: auto;
border-color: rgba(var(--swatch-primary-darker), 1);
background-color: rgba(var(--sidebar-bg-color, 255, 255, 255), 1);
translate: calc(var(--sidebar-width-on-desktop, 1rem) - var(--sidebar-width-on-desktop, 0));
scrollbar-color:
rgba(170, 170, 170, 1) /* Thumb */
rgba(252, 252, 252, 1); /* Track */
scrollbar-color:
rgb(var(--swatch-primary-darker, 170, 170, 170), 1) /* Thumb */
rgb(var(--swatch-menubg-color, 252, 252, 252), 1); /* Track */
}

#main-content::after {
content: " ";
display: flex;
position: fixed;
top: 0;
left: 1rem;
align-items: center;
justify-content: center;
width: 1rem;
height: 100%;
max-height: 100%;
transition:
left 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
background-position 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
opacity 300ms cubic-bezier(0.4, 0.0, 0.2, 1);
background: url("https://scp-wiki.wdfiles.com/local--files/component%3Acollapsible-sidebar/sidebar-tab.svg");
background-attachment: fixed;
background-repeat: no-repeat;
background-position: center left 1rem;
background-size: 1rem 12.875rem;
pointer-events: none;
}

#side-bar:is(:hover, :active, :focus-within) + #main-content::after {
left: calc(var(--sidebar-width-on-desktop, 14.5rem) * -1);
width: 0rem;
transition:
left 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
background-position 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
opacity 300ms cubic-bezier(0.4, 0.0, 0.2, 1);
opacity: 0;
background-position: center left calc(var(--sidebar-width-on-desktop, 14.5rem) * -1);
font-size: 0em;
}

#main-content::before {
content: " ";
position: absolute;
z-index: 9;
top: var(--final-header-height-on-desktop, 0);
left: 0;
width: var(--sidebar-width-on-desktop, 14.5rem);
height: calc(100% - var(--final-header-height-on-desktop, 0.688rem) - 2.313rem);
margin-bottom: calc(var(--final-header-height-on-desktop, -2.313rem) * -1 - 2.313rem);
transition:
translate 300ms cubic-bezier(0.4, 0.0, 0.2, 1),
opacity 300ms cubic-bezier(0.4, 0.0, 0.2, 1);
opacity: 0.5;
background-color: rgb(var(--swatch-alternate-color, 0, 0, 0));
pointer-events: none;
translate: calc(var(--sidebar-width-on-desktop, 14.5rem) * -1 + 1rem);
}

#side-bar:is(:hover, :active, :focus-within) + #main-content::before {
translate: 0;
opacity: 0;
}

#side-bar .side-block {
margin-top: 1em;
padding-left: 0.25em;
border-right-width: 0rem;
border-left-width: 0rem;
border-radius: 0;
background-color: rgb(0, 0, 0, 0);
direction: ltr;
}

#side-bar .scpnet-interwiki-wrapper {
direction: ltr;
}

/* Print Friendly Formatting by Estrella */
body.print-body {
--sidebar-width-on-desktop: 0;
}
body.print-body #main-content::before,
body.print-body #main-content::after {
display: none;
}
}

A 20th century painting focusing on SCP-5610.

Item #: 5610

Containment Class: Keter

Special Containment Procedures: SCP-5610 events are to be minimally monitored.

Meanwhile, a study of all cultures with a particular focus on shame and facades1 is to be initiated for any relations with SCP-5610. All historical documents related to felines are to be also investigated.

Description: SCP-5610 is an anomalous entity that is only observable by individuals with a cognitive resistance value of 5.6 and above. Approximately 56 percent of Japan's population has been found to have an instance of SCP-5610 resting atop of their head. However, no discomfort is felt by the subject these instances are resting on.

As a subject's behavior in public becomes more congruent to their behavior in private, the instance of SCP-5610 becomes increasingly detailed. This continues until it produces one of two results: either the instance would vanish, or in approximately six percent of all cases, it transforms into a non-anomalous cat(Felis catus) and jumps off the subject's head.

SCP-5610 is prominently featured in haikus; living authors, when questioned, remember it. Notable ones are translated below.

It is humankind

To put a cat on the head2

To love and hate swords

-Oda Nobunaga, 1580

When a child suckles,

The cat inside him also does,

Partnered on rough paths

-Basho, 1672

Are we not all cats

On heads of weak, chatting mice

Or hardened tigers?

-Emiri Takagata, 1923

To the barrack bed,

An old cat jumps from my head

Meowing with pity

-Jou Takamiki, 1944

Bored, Oneko3 sighs,

Telling me to cry for him

Yet I save face, tears

-Deo Takamiki, 1944

Banging the weak wall,

From my rotten, though shined crown

A cat skitters through

-Aiko Torikatsu, 1976

The cat leaves haughty,

My thoughts, like leaves on a pond

Float in unison

-Moeka Horinami, 1980

Reflections of mine

A cat claws back from the top

I smile sadly now

-Haruki Murakami, 1998

Update: Several historical records in Egypt, dating as far back as 3500 B.C. have been noted for indicating manifestations of SCP-5610.

Footnotes

1. Such as Japanese honne and tatemae, which revolve around public and private appearances.

2. 猫をかぶる. A popular Japanese idiom. It means to feign a favorable personality.

3. Polite form for cat