There were Tangrams
There were Tangrams
The Annotated Alice put in an appearance even though the narrator didn't want to.
Some learned to play Hex.
Blue has just blocked red's planned path.
We did some string figures.
Some who were here knew how to do Jacob's Ladder, Cup and Saucer, Crow's Feet, Cat's Whiskers and showed us how.
Some topological puzzles were there to provide a challenge for some of us.
Though this 4 year old didn't have a problem solving these.
Topological tangles of ropes and people was both puzzling and magic.
Everyone liked to try to predict what would happen when they cut a mobius strip.
The works of M C Escher and Scott Kim were on hand to puzzle over and enjoy.
We had instruction in origami.
Martin Gardner had many packing puzzles in his columns.
Here is a packing puzzle for you.
A shopkeeper had a problem with his helper who wasn't able to count to 100. To make it possible for the helper to count the change at the end of the day he built a small tray that would hold exactly 10 rows of 10 pennies each. He told the helper if he filled the tray evenly he would have exactly 100 coins worth $1.00. The shopkeeper was annoyed when he checked the count one day and found that there were always 105 coins when he thought there should have been 100. However, since the state had just started collecting a 5% sales tax he decided that he could use the extra to cover the tax. That worked until the local county imposed an additional 1% tax. When he told the helper that they would have to add 1 penny more than would fit in the tray the helper said he could put another penny in if he just arranged them a little differently.
The helper also suggested that they put legs on the tray so they could call it a tax table.
What were the three arrangements of the coins?
Look closely and you can see one of the solutions in the second picture.
There was a little physics magic.
Even the youngest were able to participate.
A few more pictures of the event.