.taichi {
	width:500px;
	height:500px;
	background:#ccc;
}
.circle {
	position:relative;
	height:100%;
}
.half {
	width:50%;
	height:100%;
	position:absolute;
}
.half_w {
	background:#fff;
	left:0;
	border-radius:100% 0% 0% 100%/50% 0% 0% 50%;
}
.half_b {
	background:#000;
	right:0;
	border-radius:0% 100% 100% 0%/0% 50% 50% 0%;
}
.top_circ {
	width:100%;
}
.sec_circ {
	width:50%;
}
.fin_circ {
	width:50%;
}
.top_circ,.sec_circ,.fin_circ {
	height:100%;
	position:absolute;
}
.full_circle {
	position:relative;
	width:100%;
	height:50%;
	left:50%;
	border-radius:50%;
}
.full_circle_w {
	background:#fff;
}
.full_circle_b {
	background:#000;
}
.fin_circ .full_circle {
	height:25%;
	width:50%;
	position:absolute;
}
.fin_circ .full_circle_b {
	top:11.5%;
	left:67.5%;
}
.fin_circ .full_circle_w {
	bottom:11.5%;
	left:67.5%;
}