Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Nonconscious Mimicry01:13

Nonconscious Mimicry

4.9K
Nonconscious mimicry occurs when individuals alter their mannerisms to match the behaviors and expressions of those nearby, without intention.
4.9K
Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

6.1K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
6.1K
Visual Agnosia01:12

Visual Agnosia

645
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
645
Causes of Similarity-Dissimilarity Effect01:26

Causes of Similarity-Dissimilarity Effect

114
The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
114
Understanding Deception01:14

Understanding Deception

81
Deception is a pervasive aspect of human communication. Empirical studies have shown that most individuals engage in some form of deceit on a daily basis, with approximately 20% of social exchanges involving deceptive elements. Lying follows a developmental trajectory, peaking during adolescence and declining with age, possibly due to the maturation of cognitive control and social accountability.Cognitive and Social Factors in Deception DetectionDespite its prevalence, accurately detecting...
81
The Availability Heuristic01:08

The Availability Heuristic

6.7K
A heuristic is a general problem-solving framework (Tversky & Kahneman, 1974). You can think of these as mental shortcuts that are used to solve problems. Different types of heuristics are used in different types of situations, and the impulse to use a heuristic occurs when one of five conditions is met (Pratkanis, 1989):
6.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Face pareidolia is sensitive to spectral power and orientation energy.

i-Perception·2025
Same author

The impact of simulated cataract on face learning.

Scientific reports·2025
Same author

Contrast negation increases face pareidolia rates in natural scenes.

Journal of vision·2025
Same author

Effects of maze appearance on maze solving.

Attention, perception & psychophysics·2025
Same author

Is visual information use during facial emotion recognition related to eating disorder symptoms in college-aged men and women? An experimental study.

Journal of eating disorders·2024
Same author

The role of texture summary statistics in material recognition from drawings and photographs.

Journal of vision·2023
Same journal

Predictive models and parameter analysis for multiple tactile perceptions in skin-wet fabrics interface.

Perception·2026
Same journal

High-resolution kitsch by AI: Why society needs art, not more AI content.

Perception·2026
Same journal

Benchmarking spatial discrimination thresholds of two-frame motion defined forms compared to luminance and stereoscopic defined forms.

Perception·2026
Same journal

The effect of face masks on the perception of trustworthiness and competence in individuals with autistic traits.

Perception·2026
Same journal

The importance of external features for categorizing ethnicity: can Koreans identify Korean, Japanese, and Chinese faces?

Perception·2026
Same journal

Interoception, alexithymia, and motor congruency: Psychological drivers of body ownership in virtual reality.

Perception·2026
See all related articles

Related Experiment Video

Updated: Nov 20, 2025

Virtual Hand with Ambiguous Movement between the Self and Other Origin: Sense of Ownership and 'Other-Produced' Agency
08:01

Virtual Hand with Ambiguous Movement between the Self and Other Origin: Sense of Ownership and 'Other-Produced' Agency

Published on: October 28, 2020

5.9K

The Fork-and-Knife Illusion.

Blaise Balas1,2, Benjamin Balas2

  • 1Benjamin Franklin Middle School, United States.

Perception
|January 21, 2021
PubMed
Summary
This summary is machine-generated.

A simple metal knife and fork can create a transparency illusion. The knife appears transparent when positioned correctly, sometimes alternating with a reflective appearance, offering a unique visual perception phenomenon.

Keywords:
material perceptiontransparencyvisual illusions

More Related Videos

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
06:53

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation

Published on: March 1, 2017

13.6K
Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

26.6K

Related Experiment Videos

Last Updated: Nov 20, 2025

Virtual Hand with Ambiguous Movement between the Self and Other Origin: Sense of Ownership and 'Other-Produced' Agency
08:01

Virtual Hand with Ambiguous Movement between the Self and Other Origin: Sense of Ownership and 'Other-Produced' Agency

Published on: October 28, 2020

5.9K
Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
06:53

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation

Published on: March 1, 2017

13.6K
Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

26.6K

Area of Science:

  • Visual Perception
  • Psychophysics
  • Optical Illusions

Background:

  • Illusory percepts often arise from the placement of mirrored surfaces.
  • Existing research primarily focuses on how mirrors alter the perception of external objects.

Purpose of the Study:

  • To describe a novel transparency illusion using common objects (metal knife and fork).
  • To investigate the conditions affecting the illusion's strength and its relation to known phenomena.

Main Methods:

  • Observational study of a visual illusion with a metal knife and fork.
  • Systematic variation of object configuration to elicit and analyze the transparency effect.
  • Qualitative assessment of observer experiences, including bistable perception.

Main Results:

  • A specific configuration of a knife and fork induces a transparency illusion where the knife appears see-through.
  • Some observers report a bistable percept, with transparency alternating with reflectivity.
  • The illusion's strength is influenced by specific conditions, distinct from typical mirror-based illusions.

Conclusions:

  • This illusion uniquely highlights the perception of the mirrored surface itself, rather than its effect on external objects.
  • The phenomenon offers new insights into visual processing and the perception of reflective surfaces.
  • Further research can explore connections to existing theories of visual illusions and surface perception.