Create Big Image
Make a big image (picture) for the micro:bit LED screen. The big image made of two squares. Each of the squares is five LEDs on a side, like a regular image.
images.createBigImage(`
    . . # . .   . . # . .
    . # # # .   . . # . .
    # . # . #   # . # . #
    . . # . .   . # # # .
    . . # . .   . . # . .
    `);
Parameters
ledsis a string that says which LEDs on the screen should be on and which should be off.
Example: Flip-flopping arrow
This program makes a big image with a picture of an arrow pointing up,
and an arrow pointing down.  If you press button A, the program will
show the arrow pointing up, which starts 0 LEDs from the left in the
big image.  If you press button B, the program will show the arrow
pointing down, which starts 5 LEDs from the left.
let arrows = images.createBigImage(`
    . . # . .   . . # . .
    . # # # .   . . # . .
    # . # . #   # . # . #
    . . # . .   . # # # .
    . . # . .   . . # . .
    `);
input.onButtonPressed(Button.A, () => {
    arrows.showImage(0);
});
input.onButtonPressed(Button.B, () => {
    arrows.showImage(5);
});
See also
image, create image, show image, scroll image, show animation