Explore how context and attention can influence what you notice. These are learning activities, not medical or ability tests.
6 original activities1 interactive model3 quick questions
TRY IT IN YOUR BROWSER
Same centre. Different surroundings.
Both centre squares use exactly the same grey. Change the surroundings, then reveal a connecting strip. Your experience may vary with your screen and viewing conditions.
Programmed centre values: RGB(128,128,128) on both sides.
Check the evidence
Your screen and visual experience may affect the impression. Use the controls to compare the surroundings while keeping both centre values fixed.
Interactive result appears here when scripts are enabled.
Predict. Try. Understand.
Pause at each question before opening the explanation. Examples are invented for learning unless stated otherwise.
IDEA 01
The background changes the impression
Can identical grey squares look different?
TRY / THINK
Compare the two squares above, then switch to equal backgrounds. Reveal the connecting strip to check their programmed equality.
Explore the explanationWHY IT WORKS
Perception uses surrounding information as well as the central signal. The centre pixels here have the same RGB values. A visual difference you experience does not mean the software changed those values. This is a demonstration, not a diagnosis of vision.
Worked example
Both centres are RGB(128,128,128). One begins on a dark field and the other on a pale field. The connecting strip uses that same grey.
TAKE IT INTO PLANNING
Compare dashboard values with consistent scales and backgrounds; styling can influence your impression.
IDEA 02
Read the actual instruction
How many times does the word “the” occur here: “Check the label before the carton leaves the dock”?
TRY / THINK
Count once quickly, then point to each word. Now ask someone to write a different sentence for you to check.
Explore the explanationWHY IT WORKS
Attention is selective. Familiar patterns can encourage quick reading, while deliberate checking changes the task. Missing something once is not evidence of poor intelligence or a medical condition. Use a check that matches the consequence of an error.
Worked example
The sentence contains three instances of “the”. A step-by-step count makes the evidence visible.
TAKE IT INTO PLANNING
For a release instruction, verify item, quantity and date separately instead of relying on a general sense that it looks right.
IDEA 03
Pictures can suggest movement
How could a dot seem to travel if the screen shows only separate positions?
TRY / THINK
Sketch a dot at the left, middle and right on three small cards. Look at the sequence without trying to flash the cards rapidly.
Explore the explanationWHY IT WORKS
A sequence of still positions can create an impression of movement when presented at suitable intervals. Timing, spacing and the visual system all matter. Calling this only an eye holding a picture is an incomplete explanation.
Worked example
Positions at x = 10, 30 and 50 show equal 20-unit jumps. Positions 10, 20 and 50 suggest an increasing step size.
TAKE IT INTO PLANNING
An animated flow arrow can explain a process, but it does not prove that a shipment is moving in real time.
IDEA 04
Two viewpoints tell a richer story
Does one picture reveal how far every object is from the camera?
TRY / THINK
Think of two boxes aligned in a photograph. Sketch how they could be close together or far apart while looking aligned from one viewpoint.
Explore the explanationWHY IT WORKS
A flat image discards some depth information. Two viewpoints can help constrain the arrangement, but texture, occlusion and measurement also matter. The examples here are conceptual and do not test eyesight.
Worked example
A small nearby box and a larger distant box can occupy similar areas in a picture. Equal screen size does not prove equal physical size.
TAKE IT INTO PLANNING
A map marker gives a location, not a complete account of inventory, shipment contents or business relationships.
IDEA 05
A feeling is not a calibrated instrument
Does “this room feels warm” state its temperature?
TRY / THINK
Write two descriptions of a room: one based on comfort, another using an imaginary thermometer reading of 24 °C. Explain what each can tell you.
Explore the explanationWHY IT WORKS
Sensory experience depends partly on context and recent exposure. A measurement still needs an instrument, unit and known limitations. Use this as a thought experiment; no hot water or extreme-temperature activity is needed.
Worked example
“Feels warm after coming indoors” describes an experience. “24 °C on this thermometer” is a reading whose accuracy still depends on the instrument.
TAKE IT INTO PLANNING
Keep observations, measurements and interpretations separate in an incident report.
IDEA 06
Notice, decide, respond
Does a fast response on one phone prove someone is a faster thinker?
TRY / THINK
List the steps between a screen changing and a person tapping: display, noticing, deciding, moving and input detection.
Explore the explanationWHY IT WORKS
A device-based response time combines human and technical delays. One measurement cannot isolate all those parts. A repeated, controlled experiment can improve the comparison, but still needs careful interpretation.
Worked example
A measured 300 ms is not necessarily 300 ms of human decision time. Display refresh and input handling contribute too.
TAKE IT INTO PLANNING
Measure a whole workflow and its components before blaming a person for delay.
A SMALL CHECK, NO PRESSURE
What did you notice?
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The explanations, examples, questions and diagrams on this page were written for Supply Chain Ideas. The underlying principles are established science and mathematics, not claims of invention. The following references support further study; their text and illustrations are not reproduced.
Models simplify reality. Numbers are fictional or mathematical examples; screen demonstrations are not operational, navigation, medical or chemical-safety advice. AllIdeas stores no answers and makes no external data requests. External reference links have their own privacy terms.