Design submitted by Heather from the USA.
Heather says: I came up with the idea for Concave when I thought about making circular digits, one behind the other. In order to accomplish this, although the display is flat, I imagined each digit to be a curved surface, like a contact lens, for example. By placing the digits one behind the other, and increasing size, we can see these concentric circular digits, each whose center segment is being partially blocked by the digit in front of it.
Tokyoflash Japan 