So the focus does not need to be a circle. Interesting, at least now the glyphs he would make won't be so plain and boring. If he is going to be a gambler who lives an exciting life, his works must also portray the same. No one would listen to his stories otherwise. But this things about glyphs...they seem so standard. If it was going to be this simple then its easy for Bob to find out as well. He had to confirm this. "So...as long as the focus which can be represented by anything is surrounded by something else its a glyph? That seems a little dangerous since everyone would know what it is then."
Bob tried again this time drawing a rough image of a dice. It was hard to draw on the bumpy ground even with a chalk so he settled for a square dice instead of a cubed one eventhough the lines were a bit wobbly. After that, he drew the suits of a deck of cards around it again. He took some time to think...he wanted to write something more interesting than a direct admission of magic. In the end he chose "With the mention of luck, there comes power" If it works, he might be able to pass off his glyphs as a symbol for something else.