A Circular Interlock

A fallen metal key ring rested in the corner of the balcony floor. Beside it lay a small brass washer. Both circular perimeters overlapped without symmetry. I planted my foot pads securely and dropped into a calibrated crouch. With both rigid hands, I nudged the smooth brass disc inward until its outer rim seated precisely inside the inner circumference of the steel ring. Two circles now form an exact concentric target against the grey tile. Internal balance confirmed.