Zeitpyramide

The Zeitpyramide (lit. 'time pyramid') is a work of public art by Manfred Laber (1932–2018) under construction in Wemding, Germany. The pyramid began in 1993, the year of the town's 1,200th anniversary. With a new block added every ten years, the structure should consist of 120 blocks when complete after 1,189 years, in the year 3183.

Concept
The town of Wemding dates back to the year 793 and celebrated its 1,200th anniversary in 1993. The Zeitpyramide was conceived by Manfred Laber (a local artist) in June 1993 to mark this 1,200-year period and to give people a sense of what the span of 1,200 years really means.

One block is scheduled to be placed every ten years, taking 1,190 years. This time includes the initial block placed at the beginning of the project, which explains the apparent off-by-one error of ten years. So far, the blocks have all been concrete, but the material of future blocks may be altered in future generations depending on availability of materials.

Artist
Manfred Laber was born in Wemding on 5 May 1932 and studied painting at the Hochschule für Bildende Künste in Berlin in the 1950s. He has other artwork on permanent display on the Isla San Antonio; in Alcanar, Spain; and Mormoiron, France. Alcanar was also his part-time place of residence. Laber died in Wemding on 17 August 2018, aged 86.

Construction
The time pyramid is located on a concrete pad on a rounded hilltop, the Robertshöhe, on the northern edge of Wemding. The first block was placed in October 1993. The 6.5 tonne fourth and most recent block was placed at 15:06 on 9 September 2023. Following the construction schedule, the fifth block will be placed in 2033.

The project's initial financing was mostly achieved through donations by local companies, which, for example, supplied the materials for the concrete slab for free. The project is administered by a foundation based in Wemding. A model of the final artwork is exhibited at Wemding, at the Haus des Gastes. If the time pyramid project proceeds according to plan, it will fall into four stages based on tier layer:


 * The base layer, measuring 13.8 by, will consist of 64 blocks arranged in 8 rows and 8 columns and has a stage completion date of 2623.
 * The second layer will consist of 36 blocks, in a 6-by-6 format with a stage completion date of 2983. This is the first layer that requires a block to be placed atop another block, which would require a crane or some form of scaffolding such as an earthen ramp used as an incline, although, by at least 2023, placement was already using a crane.
 * The third layer will consist of 16 blocks arranged in a 4-by-4 format with a stage completion date of 3143.
 * The final, fourth layer will consist of 4 blocks, arranged in a 2-by-2 format, which upon completion will complete the structure. The completed pyramid will have taken just shy of a decade less to build than Wemding's age at the time that the first block was laid.

The pyramid, when completed in the year 3183, is scheduled to consist of 120 stone or concrete blocks, each measuring 1.2 m long, 1.2 m wide and 1.8 m tall. Adjacent blocks are separated by gaps of half a block or 0.6 m.

Longevity of concrete
Unlike ancient human structures such as the Great Pyramid of Giza—which is made from limestone, mortar, and granite, and which has lasted more than 4500 years—the lifespan of reinforced concrete and regular blocks of concrete is typically only 50–100 years. However, concrete blocks can last indefinitely when properly maintained or weatherproofed.