Back to topics

One drawing, a vase or two faces

Look at Rubin's famous optical illusion one way, and you see a white chalice in the center; blink, and it flips into two dark faces staring at each other in profile. Because both shapes share the exact same border line, your visual system has to decide which region is the foreground 'figure' and which is the background 'ground.'

3–5 min

Questions you could explore

  • Which boundary belongs to the figure in each interpretation?
  • What does the image demonstrate without explaining every brain mechanism behind it?

Start reading

Ready to try your ideas aloud?

Your topic carries over. Record up to 2½ minutes, depending on your plan.

Psychology

Can an option nobody wants change what people choose?

Choosing between two offers can feel different when a third appears beside them. A decoy is less attractive than one option on the relevant features, but its presence does not reliably change every decision.

5–7 min

Can an option nobody wants change what people choose?

Psychology5–7 minChoosing between two offers can feel different when a third appears beside them. A decoy is less attractive than one option on the relevant features, but its presence does not reliably change every decision.

How can you miss something that is right in front of you?

Psychology3–5 minLooking at a scene does not mean noticing everything in it. When attention is occupied by one task, something plainly visible can go unreported, a pattern called inattentional blindness.

Psychology

When a question reshapes a memory

After a car crash or a crime, the way an investigator phrases a single question can change what a witness remembers seeing. Research on eyewitness reports separates what someone originally observed from information introduced afterward, making question wording a crucial part of the evidence problem.

3–7 min

When a question reshapes a memory

Psychology3–7 minAfter a car crash or a crime, the way an investigator phrases a single question can change what a witness remembers seeing. Research on eyewitness reports separates what someone originally observed from information introduced afterward, making question wording a crucial part of the evidence problem.

One drawing, a vase or two faces | Speech Topic | speaking.app