## HyperCard & Tessellations

#### Suzanne Alejandre

HyperCard Tips || Tessellations with Rotations || ...with Reflections || Where's the Math?

#### Step One

Using the rectangle tool, draw a black square. If the shift key is
held down as the "rectangle" is drawn, it will make a square.

#### Step Two

Using the lasso, start at the top corner, wiggle around as you are going down, and exit the lower corner of the square. A section of the square will be selected.

#### Step Three

Hold the shift key and slide the chunk over to the right. Position the chunk on the right side, leaving no overlap and no gaps. [Also possible would be to start on the right side, select a chunk, and slide it to the left.]

#### Step Four

Then repeat the process but this time go from top to bottom
or bottom to top.

#### Step Five

Use the pencil or paint brush (with the white pattern selected) to decorate the figure. Do not add anything to the outer edges of the silhouette.

#### Step Six

Use the lasso and position the figure up higher on the card. Hold option, slide the copied figure to the side. In HyperCard this is a faster method to copy/paste if work is being done on only one card.

#### Step Seven

With one of the black figures still selected, go to "paint" in the menu and select "trace edges". The result is a white version of the black figure.

#### Step Eight

Using the lasso, hold "option" down and "copy" by sliding one black figure to the side. Lasso the white figure, hold "option" down, slide a white figure off and fit it into position up against the black figure. Hint: If it does not fit perfectly, review Steps 1 - 8 and try again. Continue this procedure until you have created a tessellation.

#### HyperCard Tessellation

Here are some inspirational pictures from the World of Escher.

Here is a Tessellation Contest your students can enter.

## Tessellation Survey

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