gistfile1.js

F = '86670S
050s0Sp`0Js5)LxeT0)0C0.Rsh,Jfc02
020.RsiW090,Rsh:00T#*jge0bRQQdxKhvs0QQC
00b9l)Wfc0pw`0

0S0
C0Sg[%ege%S0
0cg[j-Dsts0SJfc0S\n$qtud0TbR$\n+.0)*ZgV0)JWeT0sIRcgK0/Xfb4\\v'.split(0);
f = "`00000000spring00000000`00000000is0in0the0air0000000write0here00000000000000000";
for (Z in a)
  a[Z[0] + (Z[6] || Z[2])] = a[Z];
W = c.width = 375;
H = c.height = 500;
Z = b.bgColor = 12;
with(a) {
    L = function (d, h, g, e) {
        ba();
        mv(d, h);
        ln(g, e);
        sr()
    };
    fillStyle = '#FFF';
    fc(0, 0, W, H);
    fillStyle = '#000';
    for (x = Z; x--;)
      ba(),
      arc(x * 42, 19, Z, 0, 6.3, 1),
      fl(),
      fc(x * 42 - 6, 0, Z, Z);
    strokeStyle = '#00F';
    globalAlpha = .3;
    y = H;
    for (x = Z; x--;)
      L(0, y, W, y),
      L(0, y - Z, W, y - Z),
      y -= 50;
    strokeStyle = '#F00';
    L(42, 0, 42, H);
    lineWidth = 2.2;
    strokeStyle = '#000'
}
x = 72;
y = 95;
onkeydown = function (d, h, g, e) {
    R(d.keyCode - 64)
};
R = function (d, h, g, e) {
    Z +=
      (0 > d)
        ? '01'
        : F[d] + 1
};
for (i in f)
  R(f.charCodeAt(i) - 96);
setInterval(function (d, h, g, e) {
    if (p = Z.charCodeAt())
      Z = Z.slice(1),
        8 > p
          ? Z = p ^ 4
            ? F[p + 26] + Z
            : 77 + F[p + 26] + Z
          : p ^ 48
            ? p ^ 49
              ? p ^ 50
                ? p ^ 54
                  ? p ^ 55
                    ? p ^ 56
                      ? L(x, y, x += 1.25 * ((p >> 4) - 3), y += 1.25 * (p % 16 - 7))
                      : y -= 22
                    : (x += 5.5, y -= .63)
                  : (x -= 30, y -= 4)
                : (a.ba(), a.arc(x + 5, y - 12, 2, 0, 6.3, 1), a.sr())
              : x > W - 30 && (x = 42, y += 50)
            : x += 10
}, 22);

deobfuscated http://js1k.com/2013-spring/demo/1346