In the diagram, what is the value of $x?$ [asy]
draw((-4,1)--(0,0)--(4,1),linewidth(1));
draw((-1,-4)--(0,0)--(1,-4),linewidth(1));
draw((1/3,.25/3)--(1.25/3,-.75/3)--(.25/3,-1/3),linewidth(1));
draw((-1/3,.25/3)--(-1.25/3,-.75/3)--(-.25/3,-1/3),linewidth(1));
label("$150^\circ$",(0,0),N);
label("$x^\circ$",(0,-2),S);
[/asy]
The four angles shown, $150^{\circ},$ $90^{\circ},$ $x^{\circ},$ and $90^{\circ},$ form a complete rotation, a $360^{\circ}$ angle. Thus, $$150^{\circ}+90^{\circ}+x^{\circ}+90^{\circ}=360^{\circ},$$or $$x^{\circ}=360^{\circ}-150^{\circ}-90^{\circ}-90^{\circ}=\boxed{30}^{\circ}.$$