test

term.clear()

local window1 = window.create(term.current(), 1, 1, 2, 1)
local window2 = window.create(term.current(), 1, 1, 2, 1)

window1.setVisible(false)
window2.setVisible(false)

window1.write("):")
window2.write(":)")

while true do
    window2.setVisible(false)
    window1.setVisible(true)

    sleep(0.5)

    window1.setVisible(false)
    window2.setVisible(true)

    sleep(0.5)
end