Ambiguous shapes
/r/GeometryIsNeat: Geometry is Neat - r/geometryisneat - A place where you can post neat pictures of geometry. It can be anything geometric or aesthetically pleasing! - April 19, 2018 - 13:15
Wauw, looks like that staircase. Comment down below if you know the name of it please.
/r/matheducation: Math Education: Mathematics for Educators - Math education! r/matheducation is focused on mathematics pedagogy (the teaching of). Please avoid posts that are related to homework or other "How do I solve this?" type questions. There should be an emphasis on usefulness (such as good internet resources or ideas for how to teach a concept). - April 19, 2018 - 08:30
Chaos Artefact
/r/Grimdank: Grimdank Memes from the 41st millenium - Your central hub for the dankest memes from the 41st millennium and the Mortal Realms - April 19, 2018 - 03:44
謎の物体
/r/newsokur: ニュー速R - ニュー速R(ニュース速報@Reddit)は様々なニュースや話題を扱う掲示板(サブレディット)です。 Newsokur (Breaking News on Reddit) is a subreddit for Japanese news and various other topics. - April 19, 2018 - 02:00
Cool effect, appears to be the same thing as the ambiguous cylinder with slight variations.
/r/CaptainDisillusion: Hoax Happens. - Remember: Love with your heart, use your head for everything else. - April 19, 2018 - 01:02
My brain can't comprehend this object
/r/woahdude: woahdude! psychedelic! - The best links to click while you're stoned! Psychedelic, mindfucking, mesmerizing, reality-distorting or trippy games, video, audio & images that make a sober person feel stoned, or stoned person trip harder! Come for mindfucks and self-inflicted gaslighting. Or the hypnotic or mesmerising. Vivid colors, intense patterns. Mind-blowing science and philosophy. Chill or trippy music. Surrealism, absurdism and strangeness. Reminder: This is not a "reaction subreddit". - April 18, 2018 - 20:49