Hand-drawn Postcard_Coefficient of Floor Friction

**"If the coefficient of friction of the floor is zero, you'll never be able to pick up a dropped eraser."** If the coefficient of friction of the floor is zero, there's really nothing you can do. You can't pick up an eraser, and your feet can't take a single step. It's already this serious 😱 Who still wants to take exams? \ Shipping Specifications / | Size: 10.5 cm x 14.8 cm | Material: Premium Ivory Card | Each postcard comes with a protective sleeve. | There may be slight variations in paper cut, and natural black spots/color specks are possible. | Envelopes not included https://www.pinkoi.com/product/LRFSEyk3 (Add-on $10/1 pc) | Frames not included https://www.pinkoi.com/product/EryuJWFZ (Add-on $250/1 pc) **WanEr Yi Xiao**_**Postcards Worth Collecting** Every postcard holds a story. Feel the warmth and power of the words closely. We hope these postcards can convey your love for those who are too shy to say it themselves.