#opticalillusion

Live, measured metrics for the hashtag #opticalillusion from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #opticalillusion

This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.

$5.00/ year · 15-character #name
Claim #opticalillusion — $5.00/yr→
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card via hashtag.org · tokens via hashtag.space
1
Uses / 7 days
Mastodon
1
Accounts / 7 days
Mastodon
40
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 40
0.7
Avg reactions / post
Mastodon · last 40

Day-by-day usage

measured · fosstodon.org (Mastodon public tags API) · fetched 2026-07-27 08:13 UTC
0
07-21
1
07-22
0
07-23
0
07-24
0
07-25
0
07-26
0
07-27

1 uses by 1 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · fosstodon.org (Mastodon public search API) · fetched 2026-07-27 08:13 UTC
#opticalillusions
0 uses · 0 accounts / 7d
#opticalillusionchallenge
0 uses · 0 accounts / 7d
#opticalillusionmakeup
0 uses · 0 accounts / 7d
#opticalillusionsinspace
0 uses · 0 accounts / 7d
#opticalIllusionArchitecture
0 uses · 0 accounts / 7d
#opticalIllusionStreetArt
0 uses · 0 accounts / 7d
#opticalIllusionMurals
0 uses · 0 accounts / 7d
#opticalillusiongames
0 uses · 0 accounts / 7d
#opticalillusionfashion
0 uses · 0 accounts / 7d
#opticalIllusionMural
0 uses · 0 accounts / 7d
#opticalillusionart
0 uses · 0 accounts / 7d

Live pulse

measured · fosstodon.org (Mastodon tag timeline) · fetched 2026-07-27 08:13 UTC

Everything below is measured over the latest 40 public posts (spanning ~4404 hours).

Posting hours (UTC) — busiest: 13:00

00:0012:0023:00

Languages: English (32) · Spanish (1)

Avg boosts / post: 3.2

Top of the latest posts

  • This is called the Ebbinghaus illusion. It’s an optical illusion of size perception. The pink circles are exactly the same size. In the first image I show the effect. In the second I show the same image, modified to reveal the equal size. h

    Mark Wyner Won’t Comply :vm:@[email protected]♥ 13↻ 32026-01-29 08:11 UTCView post →

  • TIL about the Pulfrich effect, whereby lateral motion can be perceived as depth due to timing differences (signal delay) between the eyes. https://www.youtube.com/watch?v=Q-v4LsbFc5c The effect can be triggered by wearing sunglasses in such

    The Retro Timer 💾@[email protected]♥ 4↻ 12026-06-08 00:04 UTCView post →

  • A square paving with hexagons, Yogyakarta, Java, Indonesia The leaves and cracks almost look like small trees #TilingTuesday #geometry #tiling #MathArt #photography #design #TravelPhotography #Yogyakarta #Java #Indonesia #OpticalIllusion

    foldworks@[email protected]♥ 2↻ 122026-05-12 12:25 UTCView post →

Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/opticalillusion