I found a few fonts and alphabet images based on the idea of overlapping geometric shapes, all with different approaches.

An old updated idea: overlapping glyphs. Now with the new layers, here you are. See also zupra 3D eYe/FS.

An old updated idea: overlapping glyphs, and 3D simulation with colours. See also zupra eYe/FS.

This is a font that I made for fictional subway signage. The lowercase letters look like garbage on lower sizes.

You can use this for anything you want.

A general 2D endeme construction font designed to turn text into endemes, where the letters of each endeme are placed in each rectangle. With symbols used mostly for drawing within the grid.

The counters in breach overlap the outlines of their glyphs and extend beyond them. x-height: 3 bricks

This design was inspired distantly by medieval manuscripts where the first letter of a paragraph (or a page) is much larger than the LC.

For names or first words in a sentence: type the UC then follow directly with the first of the desired LC; all following LC in that word, or indeed in any other usual LC word, will require 1x 'space' between each letter for legibility. Some combinations of UC-LC might look better if a 'space' is used after the UC, which of course eliminates the overlap I intended but will help visually.

Pypeface is a sans serif typeface, based on the theme of compression and inspired by the form of pipes. The typeface features a number of lines and soft corners as well as overlapping and entwining tendencies pipes have. The lower case characters have been created by predominantly using two lines. Pypeface is strongly suited to the advertising industry within hardware, plumbinb and industrial indusrtial, but can be used to achiece a simple and sophisticated look within any field. It may be desirable for steampunk or sci-fi novels,games or even film credits. It could also be used very bluntly in large as each letter becomes a new maze for the eye to find its way around.