Abstract: A substrate is printed with front side and back side markings in a first color ink. The front side when viewed with reflected light includes a first marking printed in a first saturation and a first symbol printed in the first saturation. The back side when viewed with reflected light includes: a second marking printed in a second saturation; a second symbol printed in the second saturation; a third marking printed in the first saturation; and a third symbol printed in the first saturation. The first marking, the second marking, and the third marking are printed to provide an interlocking pattern of low saturation color and high saturation color when viewed with transmitted light. The second symbol is visible, and the first symbol and the third symbol are visible and indistinguishable, when viewed with transmitted light.

Abstract: A substrate is printed with front side and back side markings. The front side when viewed with reflected light includes: a first marking printed with a first gradient of two colors; a second marking printed with a second gradient of two colors; a first symbol printed with a third gradient of two colors; a second symbol printed with a fourth gradient of two colors; a third symbol printed with a fifth gradient of two colors; and a fourth symbol printed with a sixth gradient of two colors. The back side when viewed with reflected light includes: a third marking printed with the fourth gradient; a fourth marking printed with the third gradient; a fifth symbol printed with the second gradient; a sixth symbol printed with the first gradient; a seventh symbol printed with the sixth gradient; and an eighth symbol printed with the fifth gradient.

Abstract: A method of updating a data set using event-based conditions includes adding a first data point to the data set and triggering a first event indicating that the data set has changed. Adding the first data point to the data set triggers the first event. The method also includes, in response to the first event, updating conditions for completing the data set. The conditions are associated with action pathways for receiving or verifying missing data points in the data set. The method further includes triggering a second event indicating that the conditions for completing the data set have changed and, in response to the second event, distributing the conditions to a plurality of distributed services. Each of the plurality of distributed services is configured to execute one or more of the action pathways for receiving or verifying the missing data points in the data set.

Abstract: A sound masking device comprises a housing having an open end, a white noise generator within the housing, and a speaker to receive a white noise signal from the white noise generator and to emit a white noise corresponding to the white noise signal. The speaker is set back from the open end and positioned within the housing to emit the white noise toward the open end. The housing may comprise a shelf or shoulder around an inner surface of the housing located between the speaker and the open end.