Abstract: A clock case comprising a first plurality of upstanding, spaced-apart fins formed from flat sheets of material, each of the first plurality of fins having a plurality of slots extending vertically upward from a bottom edge; and, a second plurality of upstanding, spaced-apart fins formed from flat sheets of material, each of the second plurality of fins having a plurality of slots extending vertically downwards from a top edge. Each upwardly extending slot is configured to mate with a respective downwardly extending slot, whereby each of the first plurality of fins is interlocked with each of the second plurality of fins to form an orthogonal array of laterally extending fins and longitudinally extending fins.

Abstract: A clock case comprising a first plurality of upstanding, spaced-apart fins formed from flat sheets of material, each of the first plurality of fins having a plurality of slots extending vertically upward from a bottom edge; and, a second plurality of upstanding, spaced-apart fins formed from flat sheets of material, each of the second plurality of fins having a plurality of slots extending vertically downwards from a top edge. Each upwardly extending slot is configured to mate with a respective downwardly extending slot, whereby each of the first plurality of fins is interlocked with each of the second plurality of fins to form an orthogonal array of laterally extending fins and longitudinally extending fins.

Abstract: An educational audio visual clock having an image window adjacent each numeral on the clock face to show the images of twelve Presidents of the United States at any given time. Images are on an image plate behind the clock face and display the images of the first twelve presidents from midnight until noon wherein the image plate is rotated to reveal the images of the second twelve Presidents of the United States for the next twelve hours, at which point the image wheel returns to its original position. At the top of each hour an LED illuminates the corresponding presidential image and an audio device plays an audio clip related to that president.

Abstract: A clock apparatus comprises a clock case made of either an opaque material or a translucent material, the clock case enclosing an electronic circuit comprising electronic circuit elements including: a clock timer, a source of electrical current, a power switch, a switching device, and a means for illumination. The clock case comprises a pair of cubes, with an upper one of the cubes mounted at one corner, on a face of a lower one of the cubes. The cubes provide apertures having a distribution on the clock case in correspondence with the dots of a pair of dice. Windows made of either an opaque or a translucent material, cover the apertures so that light from the illumination means of the electrical circuit is visible through either the clock case or the windows as a light show in accordance with the switching device. A clock face is engaged with the clock timer and is mounted on one of the faces of the upper one of the cubes so as to be visible to a viewer of the light show.