diff -urN wf-/wf_ex.c wf/wf_ex.c
--- wf-/wf_ex.c	Wed Jan 13 00:00:00 2016
+++ wf/wf_ex.c	Sat Jan 16 00:00:00 2016
@@ -484,6 +484,17 @@
 		    { type_end } }},
 		  .data = { type_circle, &(struct circle){.r=1, .n=100} } }};
 
+		data_t *wave = &(data_t){ type_op_data_set, &(struct op_data_set){
+		  .op = { type_arr, (data_t[]){
+		    { type_zoom_and_slide, (d3_t[]){D3_ALL(2),{0,0,120}} },
+		    { type_copy_timeshift_rot, &(struct copy_timeshift_rot){
+		      .n=30,.init_sec=0,.step_sec=-0.2,.l=LINE_Z,.init_deg=0,.step_deg=180.0/30 }},
+		    { type_copy_timeshift, &(struct copy_timeshift){
+		      .n=20,.init_sec=0,.step_sec=-0.2,.init={0,50,0},.step={0,3,0}} },
+		    { type_rot_way, &(struct rot_way){.l=LINE_X_NEG,.deg_way=WAY_V2(0,360, 4,0, 1)} },
+		    { type_end } }},
+		  .data = { type_cross, (pos_t[]){{-1,0,10},{1,0,10}} } }};
+
 		data.type = type_arr;
 		data.p = (data_t[]){
 			*axyz,
@@ -496,7 +507,7 @@
 			*train,
 			*matryoshka,
 			*clock,
-			*ripple,
+			*ripple, *wave,
 			{ type_end }
 		};
 	}