# Problem designing staircase exp

**URL:** <https://discourse.psychopy.org/t/problem-designing-staircase-exp/39589>\
**Category:** Builder\
**Created:** [April 12, 2024, 9:45pm UTC](https://discourse.psychopy.org/t/problem-designing-staircase-exp/39589 "2024-04-12T21:45:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mosana](https://avatars.discourse-cdn.com/v4/letter/m/ed655f/32.png) [@mosana](https://discourse.psychopy.org/u/mosana)\
**Post date:** [April 12, 2024, 9:45pm UTC](https://discourse.psychopy.org/t/problem-designing-staircase-exp/39589/1 "2024-04-12T21:45:28Z")

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hey, I’m designing a staircase experiment using psychopy builder, in the exp there will appear the letter “C” in two possible conditions: 1. the opening of the letter pointing to the right. (normal letter c). 2. the opening of the letter c pointing to the left (c with 180 deg change).  
in the exp, the participants are asked to press witch side the opening of the letter point to (left or right). so I an using staircase to change the SIZE of the opening of the letter. for 1 right answer- the opening of the letter c will be smaller and for 3 wrong answers the opening of the letter will be bigger.  
so, I know how the staircase generally work in builder but i don’t know how can I make it so that it will change the size of the opening of the letter  
if anyone has any idea how can I make this work I will be very thankful  
have a nice day:)

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**Author:** ![wakecarter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/wakecarter/32/5753_2.png) [@wakecarter](https://discourse.psychopy.org/u/wakecarter)\
**Post date:** [April 13, 2024, 7:14pm UTC](https://discourse.psychopy.org/t/problem-designing-staircase-exp/39589/2 "2024-04-13T19:14:01Z")

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The way I’ve done this in the past is to use an O or a circle and then put a rectangle the same colour of the background in front to make the C

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**Author:** ![mosana](https://avatars.discourse-cdn.com/v4/letter/m/ed655f/32.png) [@mosana](https://discourse.psychopy.org/u/mosana)\
**Post date:** [April 14, 2024, 8:23pm UTC](https://discourse.psychopy.org/t/problem-designing-staircase-exp/39589/3 "2024-04-14T20:23:52Z")

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> [@wakecarter](#):
>
> rectang

okay, thank you very much i will try it